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Bouncing voltage gauge

Post questions and answers about your engine problems.. What is this ticking sound I hear while starting? Engine not turning over? Problems with your battery... alternator? Find out here.

Moderator: Moderators

Posted: Sat Feb 20, 2010 6:55 pm
Joined: Thu Oct 01, 2009 3:06 pm
Posts: 6
Where Did You Hear Of google
The voltage gauge on my 84 z28 sits steadily at around 13-14v. But for what ever reason which is beyond me, when i turn the left or right turn signal on the needle drops to about 11-12v then back up, at the same rate as the signal flashes. I tried replacing the alt with a new H/O one and checked all the grounds but it didnt help. Nothing else dims on the car at all, theres even a 2 Farad cap hooked up to it as well.

Its not affecting anything, its just kinda annoying. Any help would be awsome.

Posted: Sun Feb 21, 2010 5:16 pm
Joined: Sun Feb 07, 2010 7:12 pm
Posts: 3
Where Did You Hear Of Internet
My 1986 2.8 berlinetta does the exact same thing. I also swapped the alternator. From what I have figured out it's a short in the wiring, because I disconnected the ground wire for my tail lights (accidentally) and turned on the turn signal and it didn't jump, but as soon as I hooked it back up it was still jumping.

Posted: Mon Feb 22, 2010 2:53 am
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Joined: Mon Mar 27, 2006 11:49 pm
Location: Andover, United Kingdom
Posts: 1806
Where Did You Hear Of Abob visited me in a dream and told me about it.
Might be the voltage regulator - don't think these are expensive or hard to change.
1994/L Z28 6SPDMAN, K&N CAI, Jet PCHIP. Flowmaster Cat back, 52mm Edelbrock TB, Pacesetter mid-tube headers.



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