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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1667
Experience:  GM Grand Master Technician 2007. 14 year experience.
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I installed a flatbed on a 2004 GMC 3500 cab and chassis. It

Customer Question

I installed a flatbed on a 2004 GMC 3500 cab and chassis. It was a plug and play setup for the wiring harness but I have no brake light. All other lights work. I wired up the trailer plug and everything works for the trailer system even the brake lights. Any ideas?
Submitted: 8 months ago.
Category: GMC
Expert:  Pete replied 8 months ago.
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay. Have you checked to see if any fuses are blown or missing at all? Let me know,thanks Pete.
Customer: replied 8 months ago.
Yes checked all the fuses
Expert:  Pete replied 8 months ago.
O.k.,is this 4wd and what liter engine is in this model here?
Customer: replied 8 months ago.
6.6 duramax. Yes 4wd.
Expert:  Pete replied 8 months ago.
O.k.,do you have a test light or multi meter to test with at all?
Customer: replied 8 months ago.
Yes
Expert:  Pete replied 8 months ago.
O.k.,locate the VEH STOP fuse in the dash fuse panel and test across it for power or at one terminal that this fuse plugs into for power with the key on and brake pedal pressed and let me know what you come up with here. Thanks Pete

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