Explorer 99 - Trailer Light Issue

Hello All,

I am trying to troubleshoot an issue I have with my trailer and explorer. My truck is a 99 4DR. I have a 4 pin connected to an utility trailer. Turn Signals and brakes work fine on trailer, but when turning on headlights in the truck, it doesn't work on trailer and blows fuse #30 (15A Park lamps, trailer Tow relay). I verified wiring over and over. If trailer is disconnected, the fuse doesn't burn.
If anyone had any idea on other troubleshooting steps or anything I may have overlooked, pls let me know. It would be also very appreciated.

Thank you all.

 

[MountaineerGreen]

It sounds like you have a wire on the trailer rubbed raw, allowing the current to go to ground. Do you have another trailer you can connect to test?

 

[ogmios]

I know that I am going to sound very dumb on this, but could the fact that when testing the electrical, I had the connector connected, but did not have the trailer "connected" to the truck, as far as physically (Using the hitch) have anything to do with it?

 

[KPT]

No it wouldn't matter. Trailer grounds through the white wire in that plug. Not being grounded wouldn't blow a fuse anyway.

 

[MountaineerGreen]

So the connector causes problems without a trailer connected? It sounds like there are some wires touching somewhere, probably a ground touching a power wire.

 

[ogmios]

Resolved! Thank you for your help. Here is what was the issue. After checking once more, I decided to simply rewire things in the truck. Ford dumb a***s and dishonest people told me last week that all was wired correctly... well it wasn't. I reconnected the 4 wires from the truck and miraculously, there was light!
Here is how I connected: Yellow to Yellow, Green to Green, Brown to Brown, Brown with white stripe from truck to Ground from trailer.

Thank you again for your help!