Why my running lights on my trailer doesn't work brake an signal lights work

Asked by GuruHVH9D Jul 12, 2019 at 09:20 AM about the 2018 Ford F-350 Super Duty Lariat SuperCab LB 4WD

Question type: General

1 Answer
40,015

beatupchevy answered 5 years ago

clean any connections , with CLR if necessary , runners may share a bulb but different filament than brake/directional . a multi tester is good to see what has power/ground and what don't .

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