Topper center high mounted brake light - Chevy and GMC Duramax Diesel Forum
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Old 05-17-2011, 01:49 PM   eBay Motors  #1 (permalink)
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Topper center high mounted brake light

Does anyone know which wire to tap into for the brake light on the center of the topper? I tapped the yellow wire, but it flashes with the left turn as well as the brake light. I really don't want to run a wire from the back of the cab light.
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Old 05-17-2011, 02:21 PM   eBay Motors  #2 (permalink)
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Not sure if it changed on the LML, but at the rear trailer harness/spare area you'll find a small blue unused wire wrapped up...that's for the aux cap brakelight.
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Old 05-17-2011, 06:40 PM   eBay Motors  #3 (permalink)
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I tried to find it. Not having any luck so far. Everything is taped up and covered in plastic hose type covering. Can any LML owners confirm the blue wire is still there. Please post a picture if possible.
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2013 GMC Denali 3500HD, black, srw, nav, sunroof, power sliding rear widow, high idle, rear camera, b&w
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Old 05-17-2011, 07:49 PM   eBay Motors  #4 (permalink)
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Start at the trailer plug harness and work back.
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2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air, Sulastics
Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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Old 05-20-2011, 07:25 PM   eBay Motors  #5 (permalink)
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Called my dealer, after waiting 15 minutes on hold, while he searches where ever they look things like this up. He can't find a wire to hook to. Anyone got any suggestions.
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Old 08-09-2013, 07:06 AM   eBay Motors  #6 (permalink)
 
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The 07 to 13 Silverado and Sierra are sort of tricky to wire up. GM does not run a separate wire to the back of the truck for a topper. There are two ways to wire it. First you can run a wire under the truck up into the engine compartment through the fire wall and tap into the wire at the brake pedal. Usually the wire is blue. Otherwise you can use a logic box, which separates out the brake and turn signal. The logic box comes with three wires sticking out of it, yellow, green, and blue. The yellow wire goes to one turn signal and the green wire goes to the other turn signal. The blue wire goes up to the third brake light on the topper.

Last edited by Hook'em_Horns!; 08-09-2013 at 08:00 AM.
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