Tach and light switch wiring??

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Feb 19, 2007 | 11:52 PM

rwebb001

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Heel & Toe

Joined: Oct 2006

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Tach and light switch wiring??

I have a strange thing going where when I adjust my dash light brightness with my light switch, my tach goes nuts. If I turn the dash brightness all the way down then my tach will work again.

Any suggestions? I hope this is kind of a common problem and easy to troubleshoot.

Feb 20, 2007 | 12:31 AM

Big2Bird

Le Mans Master

Joined: Dec 2006

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Let's start with the basics. Fill out your profile. What is the car,year?

Feb 20, 2007 | 12:50 AM

TimAT

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Joined: Oct 2006

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From: Gladstone MO

C3 of Year Finalist (appearance mods) 2019

Quote:

Originally Posted by Big2Bird

Let's start with the basics. Fill out your profile. What is the car,year?

Noone minds offering help, but it's a bit pointless to offer wrong info. THere's so many differences between years anything offered would be a WAG.

Feb 20, 2007 | 09:43 AM

jdp6000

Melting Slicks

Joined: Jul 2005

Posts: 2,740

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From: Aurora Ontario

Without knowing the year of your car I would guess its the connector at the back of the circuit board for the tach and speedo cluster. I suspect you have an electronic tach...runs off the distributor. There are copper strands in the circuit board...each on powers something different. If the connector pin is touch the copper strand for the cluster lights and feed for the tach at the same time (it shouldn't) it would cause that problem.

Jim