2005 Chevy Silverado Brake Lights

Tiny
JSCHEVY
  • 2005 CHEVROLET SILVERADO

Electrical problem
2005 Chevy Silverado V8 Two Wheel Drive Automatic 50000 miles

The brake lights on the bed are not working. However the brake light on the cab is working. I replaced the bulbs and I checked the fuses, but that was not it. Please help me figure out what to do?

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Sunday, April 12th, 2009 AT 11:48 PM

6 Replies

Tiny
JAMES W.
  • MEMBER

First question I always ask is; do you have a trailer connector spliced in behind the bumper? 75% of the time, that's where the problem is. Please advise.

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Sunday, April 12th, 2009 AT 11:57 PM
Tiny
JSCHEVY
  • MEMBER

I believe I have one but it is factory installed. Does that make a difference? And, what in particular would be the problem there, a short or is there a fuse there?

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Monday, April 13th, 2009 AT 12:00 AM
Tiny
JAMES W.
  • MEMBER

You will want to test your trailer connector to see if you have brake lights there. You're looking for an "open" in the circuit somewhere. The brake light switch has to be functioning or the cab light wouldn't be working.


http://www.2carpros.com/forum/automotive_pictures/248092_brake_lights1_1.jpg



http://www.2carpros.com/forum/automotive_pictures/248092_brake_lights2_1.jpg



http://www.2carpros.com/forum/automotive_pictures/248092_brake_lights3_1.jpg

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Monday, April 13th, 2009 AT 12:32 AM
Tiny
JSCHEVY
  • MEMBER

I tested the harnesses that adjoin on the connection block. I get main power coming in. However, when I test the brake connections, no power. I have power to my tail lights, blinkers and all, which look to be coming from that block as well. A parts guy said that usually those blocks go out on one full side, which sounds to me like if it was the block then I would have either the right or the lefts side lights out. You said that it could be an open, but I don't know where to test it to find out, because I am not getting power to my brake lights from that block. What suggestions do you have?

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Monday, April 13th, 2009 AT 2:42 PM
Tiny
JAMES W.
  • MEMBER

You're right, the chances of both sides going bad are poor to none.
Let's start from square 1. We'll be testing at the socket for the "turn signal flasher module", under the left side of the dash. The brake lights go through this module.
The brake lights are fused seperately from a 25amp fuse(# unknown) in the underhood fuse block. This fuse should be hot all the time.
Fuse good, yes, test the orange wire at brake light switch.
Orange hot, yes, push the brake pedal and test the white wire on the BL switch.
White hot, yes? Test the white wire at the flasher module, terminal B, with brake pedal pressed.
Hot, yes?, check fuse #9 in fuse block by flasher module.
Fuse good?, yes, check the junctions and connections on the light blue wires going back to the brake light lamps.
Fuse #9 should be hot when the brake pedal is pressed.Let me know what you find.


http://www.2carpros.com/forum/automotive_pictures/248092_05_silverado_flasher_1.jpg

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Monday, April 13th, 2009 AT 5:31 PM
Tiny
ROBERT GLENN FRANCIS
  • MEMBER

Well It's now the end of April 2016 and my chevy silverado 3500 has a similar issue. Everything works except the bed lamps for the brakes. I hooked up the boat trailer and all checks out perfect. It's the twighlight zone issue. I can not find fuse #9 because the label on the lid does not show numbers for the fuses. I wish I could understand the schematics better but my studied discipline is in another field I can only get close at best. Any help would be most appreciated.

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Monday, April 25th, 2016 AT 6:37 PM

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