Instrument gauges not working - Team Camaro Tech
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post #1 of 2 (permalink) Old Mar 30th, 09, 03:20 PM Thread Starter
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Join Date: Mar 2009
Location: US
Posts: 57
Instrument gauges not working

1979 camaro berlinetta
5.7 L engine

The temperature gauge, RPM gauge, clock, brake light, and fuel gauge do not work.

1) The temperature gauge is bolted to a printed circuit board with no wires to it. The sending unit for the coolant has no wires to it either. There is a brown wire coming from the firewall that is loose that had a connection that allowed for two more wires on the opposite end. Is this brown wire for my temp, or is there another wire for the temp? The gauge is at about 120 degrees (little past minimum), but upon turning the key, it goes down to the minimum of 100.

2) There is no sending unit for the fuel yet, but is the pink - red wire at the back of the car for the fuel gauge?

3) Brake light does not work, is the wire for this tan, located under the master cylinder?

4)RPM is haywire and acts like the temp, starts at 1000 rpm but upon turning switch it permanently stay at 0. Is the wire for this blue located next to the dizzie?

5)The clock I have no idea.

All help is appreciated. Thank for it!
vince-829 is offline  
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post #2 of 2 (permalink) Old Mar 30th, 09, 07:34 PM
Senior Tech
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277
Re: Instrument gauges not working

Take a digital volt meter and measure from the battery negative terminal to the dash panel ground. You'll probably need an extra length of wire to reach, and maybe a helper. Then power up the electrical system and see if you have voltage appearing between the grounds - you should not see any voltage (actually a tiny amount is OK, less than .05 volts or so). If you see voltage you've got a bad ground on the instrument panel, or vehicle chassis. You can do the same trick with the power circuit - measure from the battery (+) to a power wire in the cluster looking for very little if any voltage drop.

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