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!
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."
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.
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
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.
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
206 views
Usually answered in minutes!
×