lighting issues - Impala Tech
Electrical & Wiring Troubleshooting electrical problems

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post #1 of 2 (permalink) Old 06-06-2014, 10:15 AM Thread Starter
Join Date: Jun 2014
Location: Iowa
Posts: 1
lighting issues

66 that has (had) turn signals , no tail or brake lights. Got to digging around to see if i could fix it. took a tester to the fuse block and had no power to the 3rd slot from the bottom marked tail. I jumped from another switched post to that slot and had both tail and brake lights but the tail lights stayed on all the time. The light switch seemed to act funny so I replaced it. Now I cannot get the right turn or brake lights to come on and the tail lights are being operated by the dimmer switch in the light switch itself ( turn the dimmer down the tail lights get dimmer) What or where does the power for the fuse block come from or how do I locate that? could the the turn signal switch be bad? ground and where?
family ride is offline  
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post #2 of 2 (permalink) Old 06-06-2014, 05:39 PM
Join Date: Jan 2006
Posts: 12,376
Welcome to the Team Don!

Yes the turn signal being bad can affect your brake lights. Any time you are dealing with an electrical issue you are dealing with a ground issue because GM chose to use the steel body as a ground instead of running a separate ground wire to each device. Rust, paint over spray, poor termination all over time have created grounding issues with these older cars.

The dimmer circuit of the light switch should not be in any way be associated with the tail lights, or your brake/signal lights.

There are wiring diagrams you can down load for free to trouble shoot your circuits if you have a ground wire going back to the battery to test to see if a bad ground is the problem before you get fully involved. You will also need a multi-meter as well as a testing probe. I find a growler that makes a noise when a circuit is powered handy to find opens in wiring.

Big Dave
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