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Electrical & Wiring Troubleshooting electrical.

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post #1 of 3 (permalink) Old Aug 4th, 04, 07:19 AM Thread Starter
Join Date: Feb 2004
Posts: 16

Wondering if anybody can help? i recently finished fixing all the lights, everything was working!! then i decided to fix the horn. well the horn relay was shot all rusted so i bought a new one and hooked up the wires exactly as they were in the right place. got the horn to work but all my exterior lights and dash lights decided not to work again! the only thing that works are my headlights and my blinkers evrything else is dead. sounds crazy but any oppinions? thanx
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post #2 of 3 (permalink) Old Aug 4th, 04, 02:16 PM
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Join Date: Mar 2002
Location: Austin, TX, USA
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Get a volt meter and measure voltage drops in series with the circuit. Incrementally test connections from the battery to the load. You'll find voltage where there shouldn't be and drops that are unreasonably large. When you feel good about the switch, fuse, connector, etc, check the ground.

Best way to check ground is to get a jumper cable and connect it to the negative post of the battery. Then you can measure ground voltage at various places including the light harness. If you see more than a 0.020 volts drop anywhere, be suspect.

Bad connections will play off each other also. For example, the switch might have been less resistive than the fuse. But when the fuse was replaced, it's resistance went down significantly. Then when the circuit is activated, the switch which was good enough before, turns out to be the weak link. Kind of like fixing christmas lights.

Be on the lookout for corrosion, heat, and voltage drops. You'll definately find it.

68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #3 of 3 (permalink) Old Aug 5th, 04, 04:43 PM
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Location: Spring Texas
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Have you checked the small fuse for the dash lights. Also make sure your light switch dimmer is not turned down.

69 Camaro Prostreet - purple w/ghost flames , 502 w/ 871 blower

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