instrument lights not working 1968 camaro - Team Camaro Tech
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post #1 of 7 (permalink) Old Mar 15th, 18, 04:10 PM Thread Starter
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instrument lights not working 1968 camaro

instrument lights and fuel level not working on my 68 Camaro, not getting any indication of power with test light on either side of the fuse with the ignition . On every other fuse I do?
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post #2 of 7 (permalink) Old Mar 15th, 18, 06:23 PM
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Re: instrument lights not working 1968 camaro

Fuse is after headlamp switch rheostat.
Twist the bejesus on headlamp switch when pulled.
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post #3 of 7 (permalink) Old Mar 16th, 18, 03:18 PM Thread Starter
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Re: instrument lights not working 1968 camaro

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Originally Posted by Everett#2390 View Post
Fuse is after headlamp switch rheostat.
Twist the bejesus on headlamp switch when pulled.
Not sure I understand “after headlamp switch”?

What I did try is to run a short wire from one of the other fuses to the left side of the small one in the picture. Dash lights are back on but don’t dim when turning the headlight nob like they typically would and fuel gauge is still pegged way past full.


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post #4 of 7 (permalink) Old Mar 16th, 18, 03:31 PM
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Re: instrument lights not working 1968 camaro

Current flow is from battery to switch to fuse to lamps to ground to battery.
Applying jumper power at the fuse is after the switch rheostat, no dimming action.

I know I'm gonna read it about current flow, the difference in training of Physics.
US Navy Electronics training, current flows from ground to positive in any circuit.
In college training, current flows from pos to neg.
Look at electron travel, an electron travels from form one molecule to the next because of the next electron having higher potential - electrons travel from neg to pos.
Civilian training is hole current - the space left empty by the traveling electron. How can you get shocked by hole current?

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post #5 of 7 (permalink) Old Mar 17th, 18, 01:18 PM
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Re: instrument lights not working 1968 camaro

Quote:
Originally Posted by Sixty8Camaro View Post
Not sure I understand “after headlamp switch”?

What I did try is to run a short wire from one of the other fuses to the left side of the small one in the picture. Dash lights are back on but don’t dim when turning the headlight nob like they typically would and fuel gauge is still pegged way past full.
What after headlight switch means is this
The taillight fuse gets it's power from the battery feed to the fuse box, from there the power gores to the headlight switch, once the switch is tuned on the headlight switch applies power thru the reostat to the LPS fuse and if everything is OK past that you get dash lights.

the gas gauge beyond full is a indication of an open circuit in the wire from the sending unit and the gauge IIRC. I can never remember which way the gauge goes when you open the circuit vs when you ground it.

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post #6 of 7 (permalink) Old Mar 17th, 18, 03:01 PM
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Re: instrument lights not working 1968 camaro

Here you go:
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post #7 of 7 (permalink) Old Mar 18th, 18, 12:21 AM
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Re: instrument lights not working 1968 camaro

Your fuel gauge wire that goes to the sending unit is either shorted to ground, or the sending unit is kaput. Typically, your dash lights have nothing to do with your fuel gauge.

Seems like the IP lights not having 12 volts at the fuse inside the car, is a poor contact at the fuse block in the middle where the halves meet.....or where the power is distributed on the engine side to the middle portion. You stated the lights won't dim when a jumper wire is used................. sounds like the rheostat part has failed on the light switch.
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