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Looks like the brown / white wire leaves the relay and goes straight to the back of the truck. Would be nice if you could find it in the cab and verify if power is coming from the relay.
im not sure where you got the schismatics from but thank you so very much!!! once this rain lets up im going to chase wires!!!
Should be the brown wire running to the back of the 7 way for trailer running lights IIRC. Sounds like you have partial function if the stop and turn signals are working so I am guessing you have a bad connection or burnt wire just on that one circuit. Test the individual prongs on the truck outlet with a test light or buy one of those circuit testers from an RV or trailer shop for $20 or so. (Handy dandy little tool). Not sure I'd recommend running the whole trailer running lights off the license plate light circuit. It could be okay but if the amperage is too high you can blow the fuse or melt the wiring on that.
I just wish I could read those things. I'm like a blonde looking at a road map when it comes to electrical schematics.
They've never done me much good either.
Unless the plug in the pickup bed was factory wired it's usually maximum cringe factor when somebody hacks into the factory wiring to add the bed plug.
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