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Trying to diagnose issue with rear brake lights on a 96 gmc

Customer Question
c3500hd cab and chassis JA: Have...
Trying to diagnose issue with rear brake lights on a 96 gmc c3500hd cab and chassis
JA: Have you checked the brake fluid? How's the level and when was it last changed?
Customer: No brake lights and when turn signal both activated, we changed the multi function switch and now the turn signals work correctly and we then changed the brake switch, still no brake lights to rear lights, we did have a white wire that worked when the brakes were activated.
JA: Are you fixing your Cab yourself? What have you tried so far?
Customer: Trying to, we have traced the wires back to the cab, no shorts than we can see
JA: Anything else you want the mechanic to know before I connect you?
Customer: Not that I can think of
Submitted: 12 months ago.Category: Chevy
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Answered in 4 hours by:
11/26/2016
Chevy Mechanic: Chris (aka-Moose), Technician replied 12 months ago
Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Chevy
Satisfied Customers: 49,129
Experience: 16 years of experience
Verified

Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.

Here is a wire diagram if needed. https://dl.dropboxusercontent.com/u/90220402/brakelights.pdf

Is the white wire to the multifunction switch powered when the brake pedal is applied?

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Chevy Mechanic: Chris (aka-Moose), Technician replied 12 months ago

Hello again Chris here,

  1. I have to assume you were not pleased with my help, because you have not replied or rated the post.
  2. What would you like to do regarding your question now?
  3. Do you still need help? Please reply I want you to get equal to or more than what you paid for.
  4. This post is coming up on the 7 day mark where it times out. That can prevent me from being able to post answers to your replies.

Thanks Chris

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Chris (aka-Moose)
Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Chevy
Satisfied Customers: 49,129
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Experience: 16 years of experience

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