67 turn signals and brake lights stop working. - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 5 (permalink) Old Dec 28th, 15, 1:13 AM Thread Starter
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Geoff Swanson
 
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67 turn signals and brake lights stop working.

I'm having an issue with the brake lights and turn signals; when they are used at the same time the brake lights don't come on and the turn signals just stop until you let go of the brake pedal.
The turn signals and flashers work in all corners as well as the brake lights when the turn signal is not being used while applying the brakes. the tail lights also work fine and work with the brake lights and the turn signals.
So, everything works how it should until you hit the brakes with the turn signal or flashers on then neither the turn signals or brake lights work, however, the tail lights are not affected at all.
I pulled my turn signal switch, disassembled and cleaned it. I mean to the point of separating the two plastic parts and cleaning all the internals. there is nothing in the switch that looks bad, or even questionable.
Anybody have this issue, or a good Hypothesis ?
I'm thinking the two are shorting each other out when used in conjunction, however, there are no fuses blowing, or blown.
The fuse block has 12 .4 volts on every post with the fuses in, so it is not corroded terminals in the fuse block as there is full voltage on either side of the fuse as stated above.
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post #2 of 5 (permalink) Old Dec 28th, 15, 5:16 AM
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Bruce
 
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Re: 67 turn signals and brake lights stop working.

Go in the trunk and start checking grounds. The ground that causes the most trouble is the one attached to the Trunk Latch Reinforcement (the wire attaches to the far side of the brace shown below). It's exposed and often the wires break or the attachment screw comes loose.


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post #3 of 5 (permalink) Old Dec 28th, 15, 3:58 PM Thread Starter
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Geoff Swanson
 
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Re: 67 turn signals and brake lights stop working.

Quote:
Originally Posted by NickeyChevelle View Post
Go in the trunk and start checking grounds. The ground that causes the most trouble is the one attached to the Trunk Latch Reinforcement (the wire attaches to the far side of the brace shown below). It's exposed and often the wires break or the attachment screw comes loose.

Nope, no bad ground, besides, the lights all work it is when you hit the brakes with a turn signal activated that the tail lights don't work and the turn signal stops flashing.
Also, there is no ground in the area you listed. there is one on each side at the sockets.
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post #4 of 5 (permalink) Old Dec 28th, 15, 4:41 PM
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Rob
 
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Re: 67 turn signals and brake lights stop working.

I've seen this problem fixed many times just by cleaning those corroded fuse terminals.

A voltage test doesn't tell the entire story on those fuse holders. If they are corroded then they can create enough resistance to ruin the functionality of the flasher. Maybe a dremel with a wire wheel will work. Perhaps a gun cleaning kit with the .22 caliber wire barrel cleaner.

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post #5 of 5 (permalink) Old Dec 30th, 15, 9:18 PM
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Re: 67 turn signals and brake lights stop working.

To determine whether or not you have a voltage drop issue with connections or simply components not functioning properly, the easiest thing to do is grab a test lamp.

Probe each CLIP on both end of the each fuse with the probe while the circuit is under load.

So for example, you can start the vehicle, initiate a turn with the signal switch and press on the brake while probing each clip related to the circuit under test. Good brightness and equal brightness on each clip while the circuit in use is a good sign.

If this passes, then the next step is to probe the connections at the turn signal switch harness connector assembly to verify power on the correct wires at the correct times. I.E. Green wire having constant power should result in passenger rear brake lamp on solid.

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