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Some people wire trailer plugs differently. If the plug is not wired differently than yours, make sure the tow ball is clean. No rust. That's where the trailer gets its ground from. Usually they will work if thats the case, but not right. I can't remember what the wire colors are right now. Go to etrailer and look up the diagram.
I"ll say, and what a **** for causing the problem, and then not fixing it. I would complain fiercely to U-haul. If the lights were fine before hooking up to trailer, and then went out, they obviously caused it. And it's not a "common toyota problem"...they're just trying to get out of it. Possibly they shorted out your headlight switch.
I experience that alot working near a uhaul and customers try to install the hitches there selves.i often find alot of expose wires that tend to ground out on the frame or come in contact with each other. check the trailer harness to make sure nothing is exposed.
You need a Trailer Light Power Module - Uhaul, or anywhere that sells hitches and accessories. The module will power the lights directly from the battery - it still hooks into your car's lighting system, but only for sensing purposes, it doesn't put an extra load on the lighting system.
Best to pop in to your local Subaru dealer and ask them what is required for wiring in a trailer plug, a lot of new vehicle require special equipment to prevent damage to the electronics that control the lighting on the vehicles, especially those that have LED style lights on them. Get a quote from them on cost of them doing the job, and for the parts only if you want to get someone else with a cheaper labour rate to do it.
There should be a 30 AMP mini blade fuse in the fuse box under the hood that you are probably missing. I assume that since you got the relays with the wiring kit, that you got the kit from a Nissan dealer. If that is true, there should be a fuse in the kit also- in a sealed bag that has the "trailer wiring harness owner's manual" in it.
Hope this is helpful!
Nissan Scope Technician- 10+ years experience in Nissan dealership.