2003 No trailer parking lights

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Eightiesrock80

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Frankfort, IL
I only have turn signals and brake lights on trailer I tested the trailer with another vehicle everything works so it’s my truck I cleaned up the negative by the spare tire still nothing all fuses are working I think I checked them all even the big relay for parking lights is OK swapped it with the fog relay help please
 

ynpmoose

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Jan 27, 2017
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Berks County, PA
First thing I would check is to see if this is a truck issue or trailer issue. Unplug the trailer and check the plug on the truck using a multi meter or test light. I don't know if you have a 4-pin or 7-pin plug, but you can Google the pin-outs to find the wire you are looking for.
 

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