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When headlights are off, brakelight works, but signal lights solid, no flash. When headlights are on taillight works, but everything goes out if brake or signal is engaged, what can I do?

First right side works perfect, every problem is only left side. When headlights are off, brakelight works, but signal lights solid, no flash. When headlights are on taillight works, but everything goes out if brake or signal is engaged. Only left side

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  • Karl Whisenand
    Karl Whisenand Apr 23, 2015

    cj k wrote: Didn't effect the problem, but I found that if the lights on, brake applied, (everything dead at that point), then turn off ignition key, (still dead), turn on the signal and taillight lights. Problem in the steering column/signal switch?

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  • Cars & Trucks Master
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This could be the brake stop switch located on the brake pedel it can be adjusted .
But your talking head lights and muiltiy function switch that controls most lights if you don;t have a seperate switch for the head lights .
It sounds spotty intermitent .
I would have to say if not the brake switch then the muility function switch on the coloum or the head light switch if its serperate from coloum switch

Posted on Apr 23, 2015

  • The Dude
    The Dude Apr 28, 2015

    Man, dude you really know your stuff. That's awesome

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  • Contributor
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I am assuming this is on an old chevy. It sou7nds that you have a bad or a loose ground , the ground is located between the battery and the front wall. Tighten the screw and your lights should work.

Posted on Apr 27, 2015

  • Anonymous Apr 28, 2015

    Sounds good!

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  • Cars & Trucks Master
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Troubleshoot your lights
Fixing lights can be difficult:

You have a tail or brake light that doesn't work, but you replaced the bulb and no change. You'll have to troubleshoot, so buy a simple volt/ohm meter.

Be sure the power is off and no power on any of the socket pins. Then clean the light socket and connection pins with a stiff brush or steel wool.

First, measure all the light socket pins for power. If you don't see any voltage, must be a fuse out or a broken wire or you aren't getting a good solid ground reference.
Turn power off and make sure the socket ground is really ground by using the ohmmeter between the socket ground and a known good ground. If the ohmmeter reading is 1 or 2 ohms the socket is probably good. If the ohmmeter measures higher, then the ground connection is bad or ground wire is broken. Try to trace the ground wire, run your own wire if you have to.
Once the the socket ground measures ok, then you have to determine which hot pin is bad.
There are two hot pins, one for each filament, tail and stop light.
Pick one and measure the voltage referenced to the, now good, socket ground.
You should have power now, so try a bulb in the socket.

Posted on Apr 23, 2015

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  • Cars & Trucks Expert
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Hello C J, I would check for a bad ground wire from rear bulb socket to car body or frame.

Posted on Apr 22, 2015

  • cj k
    cj k Apr 23, 2015

    That's what it was. I ran a wire straight from the battery just for the hell of it before I started to look at the signal switch and needless to say, I was very pleased. The base of the socket was severely deteriorated but covered with plastic, had to buy a new socket.

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  • Cars & Trucks Master
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Start by removing all the lights an testing them on that side sounds one is shorted or crossed
check trailer hitch connections
replace the blinker relay module if there is 2 switch them

Posted on Apr 22, 2015

  • cj k
    cj k Apr 22, 2015

    Didn't effect the problem, but I found that if the lights on, brake applied, (everything dead at that point), then turn off ignition key, (still dead), turn on the signal and then the taillight lights. Problem in the steering column/signal switch?

  • cj k
    cj k Apr 22, 2015

    Was a bad ground

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