Tach Problem/Dash ground problem --HELP!! - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 2 (permalink) Old Apr 30th, 03, 03:55 AM Thread Starter
Join Date: Nov 2001
Location: springfield, va.
Posts: 2

The tach in my 1969 Z/28 began to act up when I was removing the clock in the dash. It doesn't register the correct rpm. The needle moves, but not very much. I'm thinking that the "ground" wire for the dash instruments is loose, but I can't seem to find it. When I reached under/behind the dash and touched a mounting screw on the back of the tach, I got a pretty good zap from it. The clock light wire need repairing and I did that. The light and clock work but in my fiddling around, both under the dash and around the fuse block, I wonder if I dislodged something. I need some help, please!!!

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post #2 of 2 (permalink) Old Apr 30th, 03, 07:25 PM
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Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277

Get a digital volt meter and connect one of it's leads (ground / black) to the negative terminal of the battery. It might help to have an extension wire on the ground lead. Then start probing grounds with the electrical system on. You should see more that a volt on a heavily loaded ground. In most cases in will be less than 1/2 volt IMO. The readings vary somewhat. But if you find a spot where you get a big rise in voltage, you've located your bad ground. Look for missing or corroded bonding straps etc.


68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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