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Old 05-17-2020, 06:42 PM   #11
Afirehawk1
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Join Date: Feb 2016
Location: Valrico, Florida
Posts: 661
Re: 66 c10 tach wire HELP

Quote:
Originally Posted by ray_mcavoy View Post
No, you only need to use one or the other (not both).

I think you have ended up with two tach signal wires (one white and the other brown) as a result of the wiring harnesses you are using.

If you're using the Classic Update wiring from AAW, I believe that includes a tach signal wire (white). That wouldn't have been present in the factory engine/cab wiring.

And since the factory engine/cab wiring didn't include a tach signal wire, they put that in a separate 3-wire harness (brown signal wire along with a pink power wire and a gray illumination wire). It sounds like the tach conversion harness you bought is basically a duplicate of this.
Ok
Since the tach harness (pink and brown) are connected to the back of the tach itself, i should just use the brown wire to the coil and tie off the white?

Want to make sure i got this straight
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