If all of the trailer lights stopped working, I first recommend testing the connector on your Dodge ProMaster. You can use a circuit tester like # PTW2993 to test the pins while you have a buddy run through the lighting functions in the vehicle. This will help you to at least focus on the vehicle or the trailer as the source for the issue. If you don't receive power at the connector with the lighting functions activated, then you know the issue is with the ProMaster. If you do get appropriate... view full answer...
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