Question about 1993 GMC Sierra

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Rear harness was bad they replaced with trailer harness and trying to fig out what yellow brown light green an dark green are on frame of truck it hooked in to so i can fix i un hooked not knowing what had been done i have running lights brake lights but front turn bulbs come on when i hit brakes and flashes both rear turnd one way nothing other on harness white is ground on trailer replacement green is or was connected to yellow brown ? so lights have white ground a brown on each and dark green but hook them up way i remember and nothing do i re connect both greens to yellow like they were? and what about browns cause dark green on fram i don't know were it went? it's a mess helop

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  • 24 Answers

Your description, I take it, is a problem with the wiring harness going from the driver's compartment to the rear lights. If that is the case, the normal color code for GM is brown for tail lights, dark green for the right stop & turn, yellow for the left stop & turn and light green for the backup lights. Any black wires should be grounded. The white wire in the trailer harness is for a ground when used on a trailer. It sounds like you have the green and yellow T&S wires shorted together somewhere! Some of the later vehicles use separate stop and turn bulbs... these would have a separate wire for the stop lights only, but I don't think your truck is new enough for that. Good luck!

Posted on Nov 25, 2013

Testimonial: "Thank you very much I am disabiled and can not afford to take any were. i added anoter ground from alt to clean sorce and it started working great. now God bless you helped a man feeling useless fix his truck lights right. now i half to find a presser fitting to fix break line they replaced line all way to front 1 ft from broken line coming down from master cylinder i am going to un do some cicles and get length and use pipe cutter to get smoth clean cuts and hope to find right pressure unions to fit. and can do it my self. i got to eat and this truck is eating away at food money."

  • John Mitchell Nov 26, 2013

    Glad I could help you! You should use flare fittings on your truck for brake linings because of the high pressure. Compression fittings will work, but are not recognized as a safe, reliable repair.

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: No left brake light on trailer when hooked up to truck.

I had the same problem but when i tested the left turn signal then tested the brakes both brake lights would then work.

Posted on Mar 04, 2009

  • 1 Answer

SOURCE: Both rear turn signal lights flash

Bad Ground!

Posted on May 23, 2009

  • 37 Answers

SOURCE: Both rear turn signal lights flash

I did 15a and electrical for over 30 for chevrolet and seen some pretty weird stuff.To me you still have a ground problem.your idea of checking the brake light switch is a good start.both rear lamps flashing to me means the hazards are shorting across the turn and brake light circuits,because hazards stop flashing when brakes are applied.The brakes light switches in the 90's were really weird because they also incorporated the abs system.Good luck,let me know what happens.Thanks

Posted on May 26, 2009

  • 61 Answers

SOURCE: all lights work and brake light at top works.

Check a few things...
- The bulbs
- Check for ground at brake lamp connectors
- Check your wiring at the connectors for power
- Check for another fuse blown
- Do not hook up the trailer until you fix the ground problem on the trailer
- On some models, there is a module to control the rear/trailer lighting system. There may be a problem in the module.

Posted on Jul 24, 2009

  • 12 Answers

SOURCE: 99 gmc jimmy. no brake

Should be switch clear at top of brake peddle if I remember right it looks like a tube facing fire wall

Posted on Aug 05, 2010

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