Topica Loopframe_Guzzi Archive
 

Subject: RE: Found the coil - testing tach

Author: Gunnar Schwede

Date: May 24, 2005, 1:33 PM

Post ID: 1718917786


AJ,

According to the wiring the tach gets:
12 volt on the black wiring when the ignition is turned on.
12 volt (interrupted by the points) on the blue/black side.
Ground

If I would do the testing I would connect the ground, put 12 volts on
the black and then use 12 volt on the blue/black wire to check if the
tach is moving.

Gunnar


AJ Huff wrote:
 
Hi Ted.

I am sure the coil is good. And it is good to know where it is :) I
thought
I may have a bad wire from the coil (negative side) to the tach. But
when I
ran a jumper from the coil to the tach, the tach still did not work. I
was
wondering if there isn't a way to bench test an electronic tach.

-AJ

At 03:47 PM 5/24/2005, you wrote:
 You probably don't have a bad coil I say that only because they don't
seem
to go bad very often, especially if it went bad all at once (they
usually
fail slowly). But it is possible.
There are a lot of things to check and that can go wrong, I don't even
know
where to start, but coils aren't all that expensive so if you think
thats
it, replace it, but based on my experience its probably the last thing
you
are going to check... A multimeter, swappable parts and a lot of
reasoning
is your best bet.

Ted



AJ Huff
'71 Ambassador
Three Rivers, MI
MGNOC# 19917



http://www.72guzzi.2ya.com/

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