Brake lights

Asked by GuruBN15V Jan 06, 2019 at 08:32 PM about the 1994 GMC Sierra 1500 K1500 SL 4WD Extended Cab SB

Question type: Maintenance & Repair

Brake lights work when headlight switch is off
want work when headlight switch is on have
replaced headlight with new one  

2 Answers
9,760

Mike answered 5 years ago

It will be one of the following, check the bulbs for proper number and the filaments are good, ch ck the sockets to make sure the bulbs fit correctly and finally the ground wires going to the sockets can be disconnected or broken or bad, I hope this helps, take care.

Mark helpful

Nate answered 5 years ago

GuruBN15V, I have a 91 Scotsdale with the same problem. Previous owner had trailer wired in at some point so bunch of splices remain. Started with bad ground on rear frame. Next was driver side circuit board. Then was to replace headlight switch, Then was a bulb lead that melted into lamp base housing only required to bend back out towards the contact in fixture. Then the ground again, but now when I turn on headlights the rears get dim. But when I put it in gear the rears go out completely.

Mark helpful

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