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Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

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Old 04-25-2006, 01:55 PM   #1
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headlights affect tach

a few months ago i switched my gauge cluster to the 145mph, and now whenever the car is running with the lights off, the tach works like normal.. but if i turn the headlights on the tach doesn't work and turns backwards to around 7000rpm and then stops..

doesn't anyone know what causes this and how to fix it?
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Old 04-25-2006, 07:40 PM   #2
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Sounds like a problem with the ground wire.
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Old 04-25-2006, 11:31 PM   #3
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the ground wire for the tach or the headlights?
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Old 12-08-2007, 10:31 PM   #4
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Re: headlights affect tach

Well, since I searched, and this was the only thread that seemed to match my problems - I too would like to know. Does this sound like a ground for the tach, or headlights? I had an alarm that was installed poorly in my car, and I figured that was the cause for this problem. In my case when I turn the headlights or parking lights (anything that turns on the interior guage lighting) on, the oil guage drops to 0 psi, and the tach freezes at around 1000 rpm. I removed the alarm carefully, and completely - and I still have this issue. Any ideas?
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Old 12-12-2007, 05:51 PM   #5
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Re: headlights affect tach

Well the ground is not with the headlights, and I guess I could have thought harder and figured that out, seeing as the problem occurs with the headlights off, as soon as I turn my parking lights on. I'm going to pull the dash apart soon, and start tracing wires. Wish me luck?
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Old 12-12-2007, 05:51 PM
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