Tach troubleshooting!! - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

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post #1 of 2 (permalink) Old Aug 6th, 10, 12:36 PM Thread Starter
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Join Date: Apr 2005
Location: Dallas, TX
Posts: 233
Tach troubleshooting!!

I recently installed a "factory" tach in my 67. I wired it outside the normal harness since my car was not equiped with it from the factory.

Now whenever I apply the brakes, the tach goes to 7K. It also "blips" when I use the turn signals. Obviously I have a wire or two crossed.

IF I do not have the turn signals and brakes on...it works fine.

Any thoughts on where to start?

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post #2 of 2 (permalink) Old Aug 6th, 10, 06:44 PM
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Location: Va Beach VA
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Re: Tach troubleshooting!!

It reads like the elctrical system, the supply side, is being spiked by the brake lights, a lag in power from the instanteous load the brake lights induce upon the electrical system before the electrical system can correct for the load.

I would make sure the ground is good, Secondly, I would power the tach from the ACC or IGN spade at the fusebox, Thirdly, I would swap out the voltage regulator with an electronic design, Wells P/N VR715, plug & play, if you are still running an external regulated charging system.

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