Wiring harness - V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, 850 California Police - Moto Guzzi

Wiring harness: an introduction

Updated: 2011 Oct 11

The original wiring harness that Moto Guzzi used on the V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models is of very good quality. Indeed, after 40+ years, many original wiring harnesses on otherwise neglected motorcycles are still perfectly functional with insulation in very serviceable condition. Of course, the original wiring harness does not survive all assaults. Removing original terminals to fit accessories, tapping into the insulation with 3M Scotchlok T-Taps ( “vampire” taps), overloading the capacity of the wiring, and failure to keep contacts clean and corrosion free can all take their toll on the original harness. I believe it is safe to say that the biggest problem with the original harness is the person touching it.

Some people believe they can improve on the original harness. While it is certainly possible to do so, very few people actually posess the knowledge and skills to do so. It is no exageration that I've removed in excess of 25 pounds of all black wiring and relays from a single V700. The person who put in the time, effort, and expense to craft the harness must have thought it was an improvement. I beg to differ.

Bullet terminals

Updated: 2011 Feb 20

Thanks to Charlie Mullendore of Antietam Classic Cycle for providing this information on the Yahoo! Loopframe_Guzzi news group.

Bullet terminals are available in two common sizes: 4 mm (0.157 in) and 4.5 mm (0.176 in). The electrical connections on the loop frames use the 4 mm (0.157 in) sized bullet terminals.

A great place to source these bullet terminals is Vintage Connections. They offer 4 mm bullet terminals with open barrels and strain relief. Very good stuff!

Terminal insulation

Updated: 2011 Feb 23

Moto Guzzi insulated some of the terminals. Here are the general guidelines for terminal insulation:

Male bullet terminals: no insulation
Male bullet terminal with no insulation.
Photo courtesy of Gregory Bender.
Male bullet terminal with no insulation.
Photo courtesy of Gregory Bender.
Direct link to image
Female bullet terminals: black rubber insulation
Female bullet terminal with black rubber insulation.
Photo courtesy of Gregory Bender.
Female bullet terminal with black rubber insulation.
Photo courtesy of Gregory Bender.
Direct link to image
“Y” splitter: clear plastic insulation
“Y” splitter with clear plastic insulation.
Photo courtesy of Gregory Bender.
“Y” splitter with clear plastic insulation.
Photo courtesy of Gregory Bender.
Direct link to image
Male spade terminals: not used anywhere on the original harness
Female spade terminals: most had clear plastic or black plastic insuation
Female spade terminal with clear plastic insulation.
Photo courtesy of Gregory Bender.
Female spade terminal with clear plastic insulation.
Photo courtesy of Gregory Bender.
Direct link to image

Female spade terminal with black plastic insulation.
Photo courtesy of Gregory Bender.
Female spade terminal with black plastic insulation.
Photo courtesy of Gregory Bender.
Direct link to image
Ring and fork terminals: most had black rubber insulation
Ring and fork terminals with black rubber insulation.
Photo courtesy of Gregory Bender.
Ring and fork terminals with black rubber insulation.
Photo courtesy of Gregory Bender.
Direct link to image

Terminal selection

Updated: 2011 Oct 20

All terminals are of the double crimped style: one crimp into the exposed bare wire; another crimp into the insulation as strain relief. Terminals are never soldered. The only exception to this rule are the terminals used inside of the tail light to which the light bulb makes contact. These terminals were not crimped, but rather soldered.

Wire size/gauge cross-reference

Updated: 2011 Feb 23

Since Italy uses the metric standard, Moto Guzzi used metric sized wires in the construction of the wiring harness. Metric wiring is commonly designated in square millimeters (e.g., 1 mm²). To the best of my knowledge, Moto Guzzi used 1 mm² wire throughout the wiring harness except for a few instances in which they used 2.5 mm² (e.g., the heavy wires connected to the ignition switch, generator to voltage regulator, regulator to solenoid, etc).

The following table describes a variety of relationships between metric and American Wire Gauge (AWG) wiring. Please note that this table does not equate an AWG size with a metric size. The reason for not doing so is simple: the two sizing standards are not the same. Of course, AWG sized wire is readily available in the United States and is commonly used to replace metric sized wire. I leave it to the reader to study the table and make a thoughtful decision about the correct size of wire to use in a particular application. The data for this table was extracted from SI Metric.

Circular mils (the area of a circle ¹⁄₁₀₀₀ in diameter)	Equivalent circular mils (for metric sizes)	American Wire Gauge size (AWG)	Metric wire size mm²	Stranding / wire diameter per strand		Approximate overall diameter
Circular mils (the area of a circle ¹⁄₁₀₀₀ in diameter)	Equivalent circular mils (for metric sizes)	American Wire Gauge size (AWG)	Metric wire size mm²	inches	millimeters	inches	millimeters
— 1020 — 1620 1620 — —	987 — 1480 — — 1974 1974	— 20 — 18 18 — —	0.50 — 0.75 — — 1.0 1.0	1 / .032 7 / .0121 1 / .039 1 / .0403 7 / .0152 1 / .045 7 / .017	1 / .813 7 / .307 1 / .991 1 / 1.02 7 / .386 1 / 1.14 7 / .432	.032 .036 .039 .040 .046 .045 .051	0.81 0.91 0.99 1.02 1.16 1.14 1.30
2580 2580 — — 4110 4110	— — 2960 2960 — —	16 16 — — 14 14	— — 1.5 1.5 — —	1 / .0508 7 / .0192 1 / .055 7 / .021 1 / .0641 7 / .0242	1 / 1.29 7 / .488 1 / 1.40 7 / 5.33 1 / 1.63 7 / .615	.051 .058 .055 .063 .064 .073	1.29 1.46 1.40 1.60 1.63 1.84
— — 6530 6530 — —	4934 4934 — — 7894 7894	— — 12 12 — —	2.5 2.5 — — 4 4	1 / .071 7 / .027 1 / .0808 7 / .0305 1 / .089 7 / .034	1 / 1.80 7 / .686 1 / 2.05 7 / .775 1 / 2.26 7 / .864	.071 .081 .081 .092 .089 .102	1.80 2.06 2.05 2.32 2.26 2.59
10380 10380 — — 13090 13090	— — 11840 11840 — —	10 10 — — 9 9	— — 6 6 — —	1 / .1019 7 / .0385 1 / .109 7 / .042 1 / .1144 7 / .0432	1 / 2.59 7 / .978 1 / 2.77 7 / 1.07 1 / 2.91 7 / 1.10	.102 .116 .109 .126 .1144 .130	2.59 2.93 2.77 3.21 2.91 3.30
16510 16510 — — 20820 20820	— — 19740 19740 — —	8 8 — — 7 7	— — 10 10 — —	1 / .1285 7 / .0486 1 / .141 7 / .054 1 / .1443 7 / .0545	1 / 3.26 7 / 1.23 1 / 3.58 7 / 1.37 1 / 3.67 7 / 1.38	.128 .146 .141 .162 .144 .164	3.26 3.70 3.58 4.12 3.67 4.15
26240 26240 — 33090 41740	— — 31580 — —	6 6 — 5 4	— — 16 — —	1 / .162 7 / .0612 7 / .068 7 / .0688 7 / .0772	1 / 4.11 7 / 1.55 7 / 1.73 7 / 1.75 7 / 1.96	.162 .184 .204 .206 .232	4.11 4.66 5.18 5.24 5.88
— — 52620 66360 — —	49340 49340 — — 69070 69070	— — 3 2 — —	25 25 — — 35 35	7 / .085 19 / .052 7 / .0867 7 / .0974 7 / .100 19 / .061	7 / 2.16 19 / 1.32 7 / 2.20 7 / 2.47 7 / 2.54 19 / 1.55	.255 .260 .260 .292 .300 .305	6.48 6.60 6.61 7.42 7.62 7.75

Wire size/gauge selection for 12 volt circuits

Updated: 2011 Jan 27

Thanks to Steve Odell for sending me this very useful information about how to select the proper gauge of wire. Please use this information in combination with Electricity usage by component and Ohm's law calculations. A note from Steve:

You will see in that chart that you can nearly wire your entire bike with 18 AWG. Many professional wirers always go up one size for a couple of reasons. One is to simply give yourself a safety margin. But the other reason, which I think is even more important, is that 18 AWG can be really hard to terminate. Connectors usually come in a range and 18 would be at the small end of that range so the connector, if not terminated perfectly, can be loose. As you know, a loose connector will cause so much resistance that the 18 AWG wire will act like a much smaller gauge and will heat up at the connector. Going up one size to 16 gives you more meat to grab when you terminate. I only use 18 gauge on stuff like idiot lights in the dash or 85/86 triggers on a relay and places where physical space is the biggest consideration for the wire.

Amperage	Length of wire
Amperage	3 ft	5 ft	7 ft	10 ft	15 ft	20 ft	25 ft
0 to 5	18	18	18	18	18	18	18
6	18	18	18	18	18	18	18
7	18	18	18	18	18	18	18
8	18	18	18	18	18	16	16
10	18	18	18	18	16	16	16
11	18	18	18	18	16	16	14
12	18	18	18	18	16	16	14
15	18	18	18	18	14	14	12
18	18	18	16	16	14	14	12
20	18	18	16	16	14	12	10
22	18	18	16	16	12	12	10
24	18	18	16	16	12	12	10
30	18	16	16	14	10	10	10
40	18	16	14	12	10	10	8
50	16	14	12	12	10	10	8
100	12	12	10	10	6	6	4
150	10	10	8	8	4	4	2
200	10	8	8	6	4	4	2

Wiring main harness: Civilian Ambassador and Eldorado with Bosch

MG# 12747107

Updated: 2011 Jul 28

Buy this main harness brand new!

Main harness for Ambassador and Eldorado civilian models equipped with a Bosch charging system.

Photo courtesy of Gregory Bender.

Main harness for Ambassador and Eldorado civilian models equipped with a Bosch charging system.

Photo courtesy of Gregory Bender.

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Brown	1 mm²	~1670 mm	Insulation is removed and the wire tinned with solder 6.3 mm female spade terminal	Starter button — to — Starter relay
Blue/black (straight tracer) I've seen both blue/black (straight tracer) and blue/black (spiral tracer). My preference is to use blue/black (straight tracer) to distinguish it from the coil functionality.	1 mm²	~1220 mm	Insulation is removed and the wire tinned with solder 4 mm male bullet terminal	Starter button — to — Fuse panel
Black	1 mm²	~860 mm	3 mm ring terminal 8 mm ring terminal	Headlight bucket — to — Frame ground in frame channel
Black	1 mm²	~855 mm	Insulation is removed and the wire tinned with solder 6.3 mm female spade terminal	Disribution block — to — Horn
Black	1 mm²	~855 mm	4 mm male bullet terminal 6.3 mm female spade terminal	Fuse block — to — Horn
Black	1 mm²	~1770 mm	4 mm male bullet terminal Insulation is removed and the wire tinned with solder	Distribution block — to — Brake switch
Yellow	1 mm²	~2480 mm	4 mm male bullet terminal 4 mm male bullet terminal	Distribution block — to — Tail light
Blue/black (spiral tracer) I've seen both blue/black (spiral tracer) and blue/black (straight tracer). My preference is to use blue/black (spiral tracer) to distinguish it from the starter functionality.	1 mm²	~1170 mm	4 mm male bullet terminal 6.3 mm female spade terminal	Fuse panel — to — Coil positive terminal
Gray	1 mm²	~1000 mm	4 mm male bullet terminal 4 mm male bullet terminal	Oil pressure light — to — Oil pressure switch
Red	1 mm²	~910 mm	4 mm male bullet terminal 5 mm ring terminal	Generator light — to — Generator
Green	1 mm²	~1700 mm	4 mm male bullet terminal 5 mm ring terminal	Neutral light — to — Neutral switch
Red	2.5 mm²	~1660 mm	4 mm male bullet terminal Crimped with starter cable terminal (at battery)	Ignition switch — to — Battery positive terminal
White	1 mm²	~1130 mm	5 mm fork terminal 6.3 mm female spade terminal	Generator — to — Voltage regulator
Red/white (spiral tracer) or Gray/red (straight tracer) I've seen both colors used on original harnesses.	2.5 mm²	~1170 mm	5 mm ring terminal 9.5 mm female spade terminal	Generator — to — Voltage regulator
Red	2.5 mm²	~300 mm	9.5 mm female spade terminal Crimped with starter cable terminal (at battery)	Voltage regulator — to — Battery positive terminal
Black	10 mm²	~830 mm	Post type lug 8 mm lug terminal	Battery positive terminal — to — Starter solenoid

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Brown	1 mm²	~2260 mm Length is a close guess.	4 mm male bullet terminal 5 mm ring terminal	Ignition switch — to — Starter solenoid
Black	1 mm²	~860 mm	3 mm ring terminal 8 mm ring terminal	Headlight bucket — to — Frame ground in frame channel
Black	1 mm²	~855 mm	Insulation is removed and the wire tinned with solder Insulation is removed and the wire tinned with solder	Disribution block — to — Horn
Black	1 mm²	~855 mm	4 mm male bullet terminal Insulation is removed and the wire tinned with solder	Fuse block — to — Horn
Black	1 mm²	~1770 mm	4 mm male bullet terminal Insulation is removed and the wire tinned with solder	Distribution block — to — Brake switch
Yellow	1 mm²	~2480 mm	4 mm male bullet terminal 4 mm male bullet terminal	Distribution block — to — Tail light
Blue/black (spiral tracer) I've seen both blue/black (spiral tracer) and blue/black (straight tracer). My preference is to use blue/black (spiral tracer) to distinguish it from the starter functionality.	1 mm²	~1170 mm	4 mm male bullet terminal 5 mm ring terminal	Fuse panel — to — Coil positive terminal
Gray	1 mm²	~1000 mm	4 mm male bullet terminal 4 mm male bullet terminal	Oil pressure light — to — Oil pressure switch
Red	1 mm²	~910 mm	4 mm male bullet terminal 5 mm ring terminal	Generator light — to — Generator
Green	1 mm²	~1700 mm	4 mm male bullet terminal 5 mm ring terminal	Neutral light — to — Neutral switch
Red	2.5 mm²	~1660 mm	4 mm male bullet terminal Crimped with starter cable terminal (at battery)	Ignition switch — to — Battery positive terminal
White	1 mm²	~1130 mm	4 mm ring terminal 6 mm ring terminal	Generator — to — Voltage regulator
Red/white (spiral tracer) or Gray/red (straight tracer) I've seen both colors used on original harnesses.	2.5 mm²	~1170 mm	5 mm ring terminal 6 mm ring terminal	Generator — to — Voltage regulator
Red	2.5 mm²	~300 mm	6 mm ring terminal Crimped with starter cable terminal (at battery)	Voltage regulator — to — Battery positive terminal
Black	10 mm²	~830 mm	Post type lug 8 mm lug terminal	Battery positive terminal — to — Starter solenoid

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Green	1 mm²	~735 mm This value was extrapolated by comparing the length the run on police handlebars with the length of the run on civilian handlebars. ~895 mm (Police handlebars)	Soldered to handlebar switch 4 mm male bullet terminal	Handlebar switch — to — Distribution block
Green/black (spiral tracer)	1 mm²	~735 mm This value was extrapolated by comparing the length the run on police handlebars with the length of the run on civilian handlebars. ~895 mm (Police handlebars)	Soldered to handlebar switch 4 mm male bullet terminal	Handlebar switch — to — Distribution block
Brown	1 mm²	~735 mm This value was extrapolated by comparing the length the run on police handlebars with the length of the run on civilian handlebars. ~895 mm (Police handlebars)	Soldered to handlebar switch 4 mm male bullet terminal	Handlebar switch — to — Fuse block
Gray/red (spiral tracer)	1 mm²	~735 mm This value was extrapolated by comparing the length the run on police handlebars with the length of the run on civilian handlebars. ~895 mm (Police handlebars)	Soldered to handlebar switch 4 mm male bullet terminal	Handlebar switch — to — Distribution block
Black	1 mm²	~760 mm This value was extrapolated by comparing the length the run on police handlebars with the length of the run on civilian handlebars. ~920 mm (Police handlebars)	Soldered to handlebar switch Insulation is removed and the wire tinned with solder	Handlebar switch — to — Distribution block

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Green	1 mm²	~180 mm	4 mm male bullet terminal 7.92 mm female spade terminal, flag style to fit within connector housing	Distribution block — to — Headlight
Green/black (spiral tracer)	1 mm²	~180 mm	4 mm male bullet terminal 7.92 mm female spade terminal, flag style to fit within connector housing	Distribution block — to — Headlight
Black	1 mm²	~210 mm	3 mm ring terminal 7.92 mm female spade terminal, flag style to fit within connector housing	Distribution block — to — Headlight

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Red	2.5 mm²	~225 mm	6 mm ring terminal 6.3 mm female spade terminal	Terminal 30/B+ on the voltage regulator — to — Terminal 30 on the relay
Red	2.5 mm²	~590 mm	6.3 mm female spade terminal 5 mm ring terminal	Terminal 87 on the relay — to — Starter solenoid
Black	1 mm²	~560 mm This length is a close guess as I do not have an original uncut harness.	6.3 mm female spade terminal 5 mm ring terminal	Terminal 85 on the relay — to — Neutral switch

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Red	2.5 mm²	~300 mm	9.5 mm female spade terminal 6.3 mm female spade terminal	Terminal 51B on the voltage regulator — to — Terminal 30 on the relay
Red	2.5 mm²	~590 mm	6.3 mm female spade terminal 6.3 mm female spade terminal	Terminal 87 on the relay — to — Starter solenoid
Black	1 mm²	~560 mm This length is a close guess as I do not have an original uncut harness.	6.3 mm female spade terminal 5 mm ring terminal	Terminal 85 on the relay — to — Neutral switch

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Black	1 mm²	~120 mm	4 mm female bullet terminal light socket terminal	Brake light sub-harness — to — Light socket
Yellow	1 mm²	~120 mm	4 mm female bullet terminal light socket terminal	Main harness — to — Light socket

Color	Size	Length (including the length of the terminals)	Terminals	Routing
White	1 mm²	~705 mm	4 mm male bullet terminal 4 mm male bullet terminal	Distribution block — to — Speedometer and tachometer illumination lights
White/black (straight tracer)	1 mm²	~705 mm	4 mm male bullet terminal 4 mm male bullet terminal	Fuse block — to — “Neutral” , “generator” , “oil pressure” indicator lights
Yellow/black (straight tracer)	1 mm²	~705 mm	4 mm male bullet terminal 4 mm male bullet terminal	Distribution block — to — “Lights” indicator light
Brown	1 mm²	~705 mm	4 mm male bullet terminal 4 mm male bullet terminal	Fuse block — to — Ignition switch
Red	2.5 mm²	~705 mm	4 mm male bullet terminal 4 mm male bullet terminal	Fuse block — to — Ignition switch

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Gray/black (spiral tracer)	1 mm²	~1600 mm	4 mm male bullet terminal Insulated female spade terminal	Fuse block — to — Flasher
Violet	1 mm²	~1220 mm	4 mm female bullet terminal Insulated female spade terminal	Turn signal sub-harness — to — Flasher
Yellow The wiring diagram in the workshop manual specifies yellow. However, the several original harnesses I've examined have used white/black (spiral tracer). My personal preference is to use white/black (spiral tracer).	1 mm²	~1920 mm This length is a guess as I do not have an original, uncut wire.	Female spade terminal 4 mm male bullet terminal	“Y” splitter — to — Right rear turn signal
Yellow/black (spiral tracer)	1 mm²	~1920 mm This length is a guess as I do not have an original, uncut wire.	Female spade terminal 4 mm male bullet terminal	“Y” splitter — to — Left rear turn signal

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Black	1 mm²	~875 mm	6.3 mm female spade terminal 6.3 mm female spade terminal	Negative terminal on the tachometer — to — Negative terminal on the coil
Black	1 mm²	~875 mm	6.3 mm female spade terminal 6.3 mm female spade terminal	Positive terminal on the tachometer — to — Postive terminal on the coil

Color	Size	Length (including the length of the terminals)	Terminals	Routing
White	1 mm²	~117 mm	4 mm female bullet terminal 4 mm female bullet terminal (shared with wire below)	Tachometer illumination light — to — White wire from the sub-harness connecting the dash to the fuse block and distribution panel
White	1 mm²	~117 mm	4 mm female bullet terminal (shared with wire above) 4 mm female bullet terminal	White wire from the sub-harness connecting the dash to the fuse block and distribution panel — to — Speedometer illumination light

Color	Size	Length (including the length of the terminals)	Terminals	Routing
White/black (straight tracer)	1 mm²	~125 mm	4 mm female bullet terminal 6.3 mm female spade terminal (shared with wire below)	White/black (straight tracer) from the sub-harness connecting the dash to the fuse block and distribution panel — to — Generator indicator light
White/black (straight tracer)	1 mm²	~125 mm	6.3 mm female spade terminal (shared with wire above) 6.3 mm female spade terminal (shared with wire below)	Generator indicator light — to — Oil pressure indicator light
White/black (straight tracer)	1 mm²	~125 mm	6.3 mm female spade terminal (shared with wire above) 6.3 mm female spade terminal (shared with wire below)	Oil pressure indicator light — to — Neutral indicator light
Blue	1 mm²	~170 mm	6.3 mm female spade terminal (shared with wire above) 6.3 mm female spade terminal	Neutral indicator light — to — Tachometer positive terminal

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Violet	1 mm²	~850 mm	Soldered to handlebar switch 4 mm male bullet terminal	Handlebar switch — to — Purple wire on the main harness (which connects to the toggle switch on the dash)
Yellow The wiring diagram in the workshop manual specifies yellow. However, some original harnesses I've examined have used white/black (spiral tracer). My personal preference is to use white/black (spiral tracer) to distinguish it from the tail light functionality.	1 mm²	~865 mm	Soldered to handlebar switch 6.3 mm female spade terminal (shared with wire below)	Handlebar switch — to — Toggle switch on the dash
Yellow The wiring diagram in the workshop manual specifies yellow. However, some original harnesses I've examined have used white/black (spiral tracer). My personal preference is to use white/black (spiral tracer) to distinguish it from the tail light functionality.	1 mm²	~510 mm	6.3 mm female spade terminal (shared with wire above) Insulation is removed and the wire tinned with solder	Toggle switch on the dash — to — Right front turn signal
Yellow/black (spiral tracer)	1 mm²	~865 mm	Soldered to handlebar switch 6.3 mm female spade terminal (shared with wire below)	Handlebar switch — to — Toggle switch on the dash
Yellow/black (spiral tracer)	1 mm²	~510 mm	6.3 mm female spade terminal (shared with wire above) Insulation is removed and the wire tinned with solder	Toggle switch on the dash — to — Left front turn signal

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Black	1 mm²	~975 mm	Soldered to handlebar switch Insulation removed	Handlebar switch — to — Radio control
Blue	1 mm²	~775 mm	Soldered to handlebar switch 6.3 mm female spade terminal	Handlebar switch — to — Front red lights
Gray/black (spiral tracer)	1 mm²	~765 mm	Soldered to handlebar switch 4 mm male bullet terminal	Handlebar switch — to — Fuse panel (to power front red lights)
Violet	1 mm²	~850 mm	Soldered to handlebar switch 4 mm male bullet terminal	Handlebar switch — to — Purple wire on the main harness (which connects to the toggle switch on the dash)
Yellow The wiring diagram in the workshop manual specifies yellow. However, some original harnesses I've examined have used white/black (spiral tracer). My personal preference is to use white/black (spiral tracer) to distinguish it from the tail light functionality.	1 mm²	~865 mm	Soldered to handlebar switch 6.3 mm female spade terminal (shared with wire below)	Handlebar switch — to — Toggle switch on the dash
Yellow The wiring diagram in the workshop manual specifies yellow. However, some original harnesses I've examined have used white/black (spiral tracer). My personal preference is to use white/black (spiral tracer) to distinguish it from the tail light functionality.	1 mm²	~510 mm	6.3 mm female spade terminal (shared with wire above) Insulation is removed and the wire tinned with solder	Toggle switch on the dash — to — Right front turn signal
Yellow/black (spiral tracer)	1 mm²	~865 mm	Soldered to handlebar switch 6.3 mm female spade terminal (shared with wire below)	Handlebar switch — to — Toggle switch on the dash
Yellow/black (spiral tracer)	1 mm²	~510 mm	6.3 mm female spade terminal (shared with wire above) Insulation is removed and the wire tinned with solder	Toggle switch on the dash — to — Left front turn signal

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Yellow The wiring diagram in the workshop manual specifies yellow. However, some original harnesses I've examined have used white/black (spiral tracer). My personal preference is to use white/black (spiral tracer) to distinguish it from the tail light functionality.	1 mm²	~1920 mm	6.3 mm female spade terminal 4 mm male bullet terminal	“Y” splitter — to — Right rear turn signal
Yellow/black (straight tracer)	1 mm²	~1920 mm	6.3 mm female spade terminal 4 mm male bullet terminal	“Y” splitter — to — Left rear turn signal
Brown	1 mm²	~1460 mm	4 mm male bullet terminal 4 mm male bullet terminal	INT on ignition switch — to — Fuse panel
Red	2.5 mm²	~1460 mm	4 mm male bullet terminal 4 mm male bullet terminal	15/54 on ignition switch — to — Fuse panel
Red	2.5 mm²	~1460 mm	4 mm male bullet terminal 4 mm male bullet terminal	50 on ignition switch — to — Fuse panel

Color	Size	Length (including the length of the terminals)	Terminals	Routing
White/black (spiral tracer)	1 mm²	~100 mm	4 mm male bullet terminal Insulation is removed and the wire tinned with solder	Fuse panel — to — Fuse holder
Black	1 mm²	~660 mm This length is a close estimate.	Insulation is removed and the wire tinned with solder Insulation is removed and the wire tinned with solder	Fuse holder — to — Left push-pull switch on dash

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Blue	1 mm²	~600 mm This length is more than ample for most front spot lights.	Female spade terminal Butt connector	“Y” splitter — to — Front spot light (right or left)
Blue	1 mm²	~600 mm This length is more than ample for most front spot lights.	Female spade terminal Butt connector	“Y” splitter — to — Front spot light (right or left)

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Yellow The wiring diagram in the workshop manual specifies yellow. However, some original harnesses I've examined have used white/black (spiral tracer). My personal preference is to use white/black (spiral tracer) to distinguish it from the tail light functionality.	1 mm²	~600 mm	6.3 mm female spade terminal 6.3 mm female spade terminal	“Y” splitter — to — Dash indicator light for right turn signal
Yellow/black (spiral tracer)	1 mm²	~600 mm	6.3 mm female spade terminal 6.3 mm female spade terminal	“Y” splitter — to — Dash indicator light for left turn signal
Blue	1 mm²	~600 mm	6.3 mm female spade terminal 6.3 mm female spade terminal (shared with wire below)	Dash indicator light — to — “Y” splitter
Blue	1 mm²	~660 mm	6.3 mm female spade terminal (shared with wire above) Insulation is removed and the wire tinned with solder	“Y” splitter — to — Left push-pull switch

Color	Size	Length (including the length of the terminals)	Terminals	Routing
Red	2.5 mm²	~480 mm	Crimped with starter cable terminal (at battery) 4 mm male bullet terminal	Battery positive terminal — to — Ignition switch
Red	2.5 mm²	~300 mm	Crimped with starter cable terminal (at battery) 6 mm ring terminal	Battery positive terminal — to — Voltage regulator
Black	10 mm²	~830 mm	Post type lug 8 mm lug terminal	Battery positive terminal — to — Starter solenoid

Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, 850 California Police Wiring harness

Table of contents

Wiring harness: an introduction

Bullet terminals

Terminal insulation

Terminal selection

Wire size/gauge cross-reference

Wire size/gauge selection for 12 volt circuits

Wiring main harness: Civilian Ambassador and Eldorado with Bosch

MG# 12747107

Wiring main harness: Civilian Ambassador and Eldorado with Marelli

MG# 12747102

Wiring main harness: Civilian V700 with Marelli

MG# 12747100

Wiring main harness: Police with Bosch

MG# 13747144

Wiring main harness: Police with Magneti Marelli

MG# 13747144

Wiring sub-harness: (all models) battery ground

MG# 12747900

Wiring sub-harness: (all models) brake light

MG# 12747500 MG# 12747501

Wiring sub-harness: (all models) coil to distributor

Models equipped with Magneti Marelli coils

Models equipped with Bosch coils

Wiring sub-harness: (all models) handlebar switch - left

MG# 12747320

Wiring sub-harness: (all models) headlight

MG# 12747420

Wiring sub-harness: (all models) starter relay

Models equipped with Magneti Marelli starters

Models equipped with Bosch starters

Wiring sub-harness: (all models) tail light

Wiring sub-harness: (all models) voltage regulator ground

MG# 12747700

Wiring sub-harness: (civilian) dash to fuse block

MG# 12747200

Wiring sub-harness: (civilian turn signals) extensions

MG# 12750705 MG# 12750805

Wiring sub-harness: (civilian turn signals) handlebar switch

MG# 12750300

Wiring sub-harness: (civilian turn signals) turn signals

MG# 12748600

Wiring sub-harness: (dual gauge dash) distributor to tach EARLY

MG# 13767700

Wiring sub-harness: (dual gauge dash) distributor to tach LATE

MG# 13767701

Wiring sub-harness: (dual gauge dash) generator light

MG# 13761300

Wiring sub-harness: (dual gauge dash) illumination interconnect

MG# 13761400

Wiring sub-harness: (dual gauge dash) indicator light EARLY

MG# 13761000

Wiring sub-harness: (dual gauge dash) indicator light LATE

MG# 13761001

Wiring sub-harness: (dual gauge dash) neutral light

MG# 13761100

Wiring sub-harness: (dual gauge dash) oil pressure light

MG# 13761200

Wiring sub-harness: (dual gauge dash) tachometer ground

MG# 13767300

Wiring sub-harness: (front brake switch) front brake switch

MG# 13748920

Wiring sub-harness: (police) dash to fuse block

MG# 13747241

Wiring sub-harness: (police) handlebar switch - early left extra

MG# 13747241

Wiring sub-harness: (police) handlebar switch - early right

Wiring sub-harness: (police) handlebar switch - late right

Wiring sub-harness: (police) handlebar switch - mid right

Wiring sub-harness: (police) ignition switch

MG# 13747641

Wiring sub-harness: (police) indicator light interconnect

MG# 13761000

Wiring sub-harness: (police) left push-pull switch

MG# 13748840 MG# 13742540

Wiring sub-harness: (police) spot light extensions

Wiring sub-harness: (police) toggle switch to “Y” splitters

MG# unknown

Wiring sub-harness: (police) turn signal dash indicator lights