Formally called the Chevrolet C/K.

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brake light and turn signal not working

Same issue . Driver's side tail light brake light and turn signal not working . Passenger side is working no reverse lights that I know of . Bulbs seem good fuses seem good. I'm not sure where under the hood the relay Could be. My trucks been fiddled with here there and everywhere fro. Old owner . Help please?! -katelyn 1988 Chev suburban some wires under dash are dangling I'm not sure where to Start without having a multimeter

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@chevy88burban, Katelyn​ , Switch or replace the bulbs from one side to the other to ensure it is not the bulbs, check the bulb sockets for any corrosion/burnt/damaged contacts. Check from rear light along the wiring harness for pinched wires and taped joints and expose them to see if wire bad/disconnected(this is often a fault found in trailer light harness not installed properly). Check all grounds in the vicinity clean and retighten. You still may have to borrow or purchase a test light to probe back through the harness till you find the break in current. Some of the auto parts suppliers offer free/deposit lend a tool like Pepboys, Nappa, Advanced auto parts,etc. may have test light/multi meter and some of the guys are very knowledgeable and may have seen the issue often and put you on the right track also. Link below is a pretty good place to get automotive schematics for your tail light wiring if needed. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

https://www.revbase.com/BBBMotor/Wd

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Hi Katelyn:

I do not have a direct answer for yo as you say the previous owner messed with the wiring. However by inputting your model and year plus wiring diagram in a Google search I found under "images" google heading so many good wiring diagram and all the wiring colors you need to do your fix. Can I point out many stores have a nice kit with a needle point, bulb and ground clip it is probably what you need to follow your wiring and repair your problem. Voltage meter is good but a 12v light and probe will gain you immediate help and free up a hand plus glancing at a meter to read each time.

All gmc wire colors are the same by the way so a year different or so will not matter.

Good luck

Alton

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Katelyn​ will be eternally grateful.
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