Trailer light problem

Since I've been using the Nitro this year, everytime I start down my driveway the trailer blows the running light fuse under the hood. I couldnt find any wires touching and earlier I went to look at it abit closer. The white trailer harness ground wire is grounded to both the trailer frame and to the truck's 4pin plug. Yet the only way the lights work is if you touch the ground wire on the trailer harness to the trailer ball. Remove it and the lights go out. I'm planning on getting a new LED kit and rewiring it in the next week or so but in the meantime anyone have any idea?

Check the ground wire on the truck side of plug it is bad.

I'll look over the plug on the truck and in the meantime I took a self tapping screw and ran it into the hitch and connected that to the trailer. lights worked....for about a mile then blew the fuse again. And that's without the truck plugs ground even being connected.

Don't know if this will help you or not, but to avoid ground problems, I ran a ground wire from the front of my trailer back to each light. That, plus getting LEDs, fixed my light problems.

If you are blowing fuses you definatly have a wire shorting out some where. Does this fuse blow without trailer pluged in if only with trailer plug in it is on the trailer some where.

I had a trailer that the light socket itself was the problem.
If you have a volt ohm meter used it at the plug and have someone pull on wires.
Also take the lens off the light and move the bulb.

I had a trailer that the light socket itself was the problem.
If you have a volt ohm meter used it at the plug and have someone pull on wires.
Also take the lens off the light and move the bulb.

Well it's not on the truck, just hooked it up to dad's H3 and it blew his fuse after he moved about 20ft with it. I may just go ahead now and get the LED kit and rewire it. I ran the wire to all the lights when I rewired my other trailers and haven't had a problem.

Sometimes it easier to redo than try to find the problem

Woodduck, do you by any chance have one of those trailers with the folding tongue? Also anytime I replace trailer lights I always run a seperate ground to each light.

What kind of plug on wiring, round or flat. If round probably got wire shorting in plug if not you have a wire grounding some where on trailer or could be inside of light.

its a round with a 7-pin to 4-flat. But it blew on my Mom and Dads H3 with their own plug as well. No swing tongue but the wires are old.

Bad ground will not blow a fuse UNLESS it is touching a hot to lights which would make you have a bad hotwire also. Like they said, I'd just rewire it.Buy a 50ft extension cord and use it in halves to run to both sides. You have running, brake/turn, and ground all in a durable sheath.

I ran my new wires through a piece of rubber hose for the last few feet toward the tongue end to keep vibration from vibrating through, or a hard tug from compromising the wire and causing problems later on. Might be overkill but it's a cheap insurance policy.