IIRC - you only need to connect the red wire if you do NOT have LED lighting.I think so. But I didn’t disconnect the battery during the instal maybe the issue. Also my fuse didn’t want to go in so I kept flipping it and jamming it. Maybe it’s not in properly or defective. I may try disconnecting the battery and removing the fuse. Maybe I have to ground the red wire I read something about. I may need to relocate my white wire ground from the rear quarter Pannel trim bolt I screwed it on. Perhaps it’s no bueno. IDK.
There’s the possibility it’s my trailer’s light too. Or the trailer’s harness.
Having re-read you post, I would suggest that you confirm that the trailer bulbs are fully functional (swap the one from the working side) and if it’s still not working then the multimeter will provide the specific answer regarding any wiring/connection issue on the trailer.
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