Question about 1985 Chevrolet Chevy
I have put in a new brake light switch and fuse. brake lights do not work with head lights on or off but all other lights do work.
Make sure your dash lights are working. If not then the headlight switch needs to be replaced. If this is okay go to the back of the truck under the rear bumper on the driver's side and you should see a plug where the tail light harness plugs into the body wire harness. Check this carefully for corrosion ( green gunk) and broken wires. Over time this plug usually corrodes up and wires rot off. I always cut it out and spliced the wires together with heat shrink tubing and tape.
The light sockets ground to the box behind the lens so make sure the black wire has bare shiny metal to metal contact on both sides of the box. The sockets themselves could also be worn enough so as to not make proper contact. Also check the wire harness at the light for chaffing and bad insulation. If I had a nickel for every time I had to fix this....... I kept a roll of tape in the truck at all times.
If you still have nothing, then you will likely have to follow the body harness back to the fuse block looking for the same thing, chaffing or broken wires. You can remove it by undoing the 5/16 bolt in the center of the block and pulling off the left side. All wires to the back of the truck are on this plug.
If you still have nothing then check under the dash. Trace the wires from the brake light switch to the wires from the blinkers. They both use the same side of the bulb. Dark green and yellow if I remember right.
If you have the floor mounted dimmer switch, check the plug in for it very carefully for corrosion. I'm pretty sure your wires go through it too, not sure why. Hope this helps.
Posted on Feb 22, 2012
Testimonial: "Well it turned out to be my turn light switch. But all the info i got was a good starting point and was grate info for next time. thanks for the help.Thanks!"
I just had this problem. i changed the brake switch but still didn't work so i change the turn signal assembly and it fixed the problem. I knew it was that when my brake lights only came on when I was signaling left. There is a cooper pin that makes contact with the steering wheel. If its not there, it won't ground and brake lights will not work.
Posted on Nov 01, 2012
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Posted on Jan 02, 2017
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