Brake Light/Rear Turn Signal Issue
Just found out I have an issue with my rear brake lights/turn signals. The problem is when the right turn signal is on, and the brakes are applied, the left brake light turns off. Otherwise, everything works as it should. Both brake lights come on fully when the brake is applied. When the lights are on, the rear lights come on fine. Also, when the lights are on, and the right turn signal is activated, and the brakes are applied, the left parking light coil (the dimmer of the two in the rear bulb) will stay on, but the brighter brake light coil will not illuminate.
No issues when the left turn signal is activated - everything works. Specs: AAW wiring harness, installed last spring. Bed center crossmember is grounded to frame. Frame is grounded to engine. Engine is connected to battery negative terminal. Thoughts? Is there an easy way to determine I need a new turn signal switch vs a ground issue? |
Re: Brake Light/Rear Turn Signal Issue
Sounds like a ground issue to me. I'd probably start by running a dedicated ground wire from each tail light to a known good ground area and see if the issue remains or clears up.
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Re: Brake Light/Rear Turn Signal Issue
It could also be that your turn signal switch contacts are gummed up.
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Re: Brake Light/Rear Turn Signal Issue
Just got done testing the tail light assemblies. Both have good ground, verified with multimeter with positive probe in the sockets and negative probe touching the housing.
Leaves me thinking is the switch, unless you fellers can think of anything else. |
Re: Brake Light/Rear Turn Signal Issue
Have you checked the bulb? Have you checked the socket? I have seen the sockets get wear and the bulb want stay in place. I've seen the bulb tabs fall off and not work. Check all the easy stuff first. Have you done any work on any of the electrical system latey?
Your brake lights and turn signals all go through the wiring harness in the steering column. Could be a wire issue outer sleeve worn through touching metal are a turn signal cam problem. Could be the bulb itself even. I'd start at the column harness connector and probe the wires that go to the rear of the truck with it in the position that gives you the problem and probe the wires and see if it does the same there if not keep moving towards the back of the truck and see where it starts being a problem.:chevy: |
Re: Brake Light/Rear Turn Signal Issue
The sockets are new and work fine, bulbs are fine.
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Re: Brake Light/Rear Turn Signal Issue
My son's truck had a somewhat similar issue. It turned out the connection wire at the bulb housing had come loose. In other words, the three wires that go into the plastic plug that plugs into the back of the taillight, one of those wires had come loose and was not making a connection. Not sure if that is even close to what you are experiencing, but what the heck. I figure I would throw it out there.
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I disagree. The circuit would have to be complete in order for the multimeter to sense a difference in the potential energy between the socket and the housing. If the housing were not grounded, the multimeter would have read zero. Regardless, with the two-wire setup on the tail lights (one pos wire for the parking lamps and one for the brake lights), a ground failure would prevent the bulbs from turning on at all. I've got good brake lights and good parking lights on both sides. The left brake light fails to come on only if the right turn signal circuit is activated. |
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Re: Brake Light/Rear Turn Signal Issue
Wanted to close out this thread. Got back from deployment and ordered a new switch to put in. Switch fixed it right up. No more issues.
The old one could have possibly been cleaned, however the plastic was cracking around the stalk pivot anyway. Biggest gripe was I had to ditch the AAW pigtails that were supplied with my new harness and wire the new switch in directly. In the future I may put them back in, but for now, it’ll do. |
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