2001 2500 hd have brake lights on the truck none on the trailer have low voltage at connector on back of the truck

Asked by Nov 26, 2016 at 06:27 PM about the 2001 GMC Sierra 2500HD 4 Dr SL Extended Cab SB HD

Question type: Maintenance & Repair

I have a 2001 GMC 2500 HD I have brake lights on the truck but nothing going threw 7 pin connector with a test light it lights real dim

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