Gregory Bender

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Sub-harness to support the use of the K&S 12-0040 universal handlebar switch.

Part number: KS12-0040

Price: $21.25 In stock

How to order

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Sub-harness to support the use of the K&S 12-0040 universal handlebar switch: civilian applications.
Sub-harness to support the use of the K&S 12-0040 universal handlebar switch: civilian applications.
Sub-harness to support the use of the K&S 12-0040 universal handlebar switch: civilian applications.

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Sub-harness to support the use of the K&S 12-0040 universal handlebar switch.

No more need to fiddle with butt connectors, soldering, or heat shrink. Just plug the 9-pin connector into the plug that came with your K&S switch, and the other ends into locations inside the headlight. Greatly simplifies installation.

This sub-harness combines the functionality of the original left and right handlebar switches to work with the K&S 12-0040 handlebar switch. Extra ground wire provided because the switch body does not provide the ground. This switch incorporates a kill switch, which cannot be used as a passing light (kill will remain non-functional unless requested). Works with switch pictured below (not included). Many other universal switches would use a very similar wiring harness. I would be happy to create a custom harness for you.

When ordering: Please specify civilian or police handlebars.

The K&S 12-0040 switch is not as popular as the 12-0030 because it lacks a passing light functionality, replacing it instead with a kill switch.

NOTE: Civilian applications refer to the civilian method of wiring turn signals (directly to the flasher). Police applications refer to the police method of wiring turn signals (through the toggle switch located on the dash).

IMPORTANT NOTE: As with all switches actuating higher amperage components, I consider relays for the headlight low and high beam circuits a necessity. I sell a very nice relay kit specifically made for this very purpose.

Close up of plug on the sub-harness I sell.
Close up of plug on the sub-harness I sell.
Close up of plug on the sub-harness I sell.

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K&S 12-0040 handlebar switch
K&S 12-0040 handlebar switch

Photo courtesy of K&S.

K&S 12-0040 handlebar switch

Photo courtesy of K&S.

Direct link to image

Installation instructions

Reference the standard installation instructions and these additional notes. Connect the following wires the same as with the original left and right handlebar switches:

  • Green
  • Green/black
  • Brown
  • Black wire with tinned end
  • Purple
  • White/black
  • Yellow/black

The following wires require different connections:

  • Black wire with ring terminal: Connect to distribution panel mounting screws. This is a new wire needed by this switch.