Jwill945
Newbie
Not familiar with these at all. I’m guessing can get a corroded or broken connection. How do I test it?Check the tail light circuit boards. Typical GMT400 prob.
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Not familiar with these at all. I’m guessing can get a corroded or broken connection. How do I test it?Check the tail light circuit boards. Typical GMT400 prob.
i dont recall ever testing the boards, but check the pigtail from the harness, if you have the voltages at the pigtail then its not wiring, and pretty clear its the board. you can also check the splitter by the spare if you have the 4 prong trailer connector.Not familiar with these at all. I’m guessing can get a corroded or broken connection. How do I test it?
There's a disconnect in the harness right near the driver's side end of frame rail. That's also where the "tee-in" style trailer harnesses connect. Best thing when troubleshooting rear lighting issues is to remove any trailer harness from the circuit first.i dont recall ever testing the boards, but check the pigtail from the harness, if you have the voltages at the pigtail then its not wiring, and pretty clear its the board. you can also check the splitter by the spare if you have the 4 prong trailer connector.
Let it ride like it was for about a week until I had to drive across town at night late on a Friday. Pulled the taillight housing off and checked everything. I had a front turn signal that would come on with parking lights but not blink with turn signal and a rear bulb that was good, but wasn’t seated in the housing correctly. Replaced those and we’re good to go!There's a disconnect in the harness right near the driver's side end of frame rail. That's also where the "tee-in" style trailer harnesses connect. Best thing when troubleshooting rear lighting issues is to remove any trailer harness from the circuit first.
Then you can check right there at the disconnect - light green is reverse, dark green is right turn signal/brake, yellow is left turn signal/brake, brown is tail lights/park lights/tag lights. Ground test light to the frame or a bed cross support nearby. The ground for the rear lamp harness attaches to that same area.
The taillight circuit boards fail usually from a burnt up socket or sometimes they just get loose and don't grip the bulb well enough anymore. They're a common source of trouble but first step would be to ensure the wiring is good as described above.
Richard
I think it goes to the back of the head, can you tell where the other end is attached?Does anyone know what this is and where it connects? I assume it's a ground for something. I discovered it while changing the plug wires. I would guess it's been disconnected for 5-8 years and the truck hasn't burned up yet.You must be registered for see images attach