Trailer lights

[coombro]

Biggest problem with trailer lights is usually not being grounded good. Then comes broken wires, bared wires shorting out against the trailer, blown bulbs, blown fuses, and poor connection grounding via the trailer ball/coupler or plug prongs. I've experienced them all ... and have yet to find any short cuts to figuring out WHY the lights don't work. You may just have to work your way thru all the possible problems, until you isolate them ... then fix it to last.

... pappy

Hit the nail on the head. Grounding big issue. some use the trailer tongue and ball for grounding as some use the white wire.

[kydonky]

Hit the nail on the head. Grounding big issue. some use the trailer tongue and ball for grounding as some use the white wire.

If you have good connection to turn signals it's probably not a ground problem. You say the side marker and tail lights are not working. The tail lights and the side lights are on the same circuit (powered with the same wire). I would say you have a bad connection with the tail light wire.

Get a cheap 12v tester. Start at the plug connection then the wire behind the plug. If you have power going to the plug but not out of it get a new plug.

[bankbuster]

Woo-Hoo Found bad fuse under the hood. It is even labeled Trailer Parking Lights. Thanks for all the suggestions guys.

[Carter1]

Don't you just love a quick and cheap fix

[Tyme2fish]

Woo-Hoo Found bad fuse under the hood. It is even labeled Trailer Parking Lights. Thanks for all the suggestions guys.

Happened to me on my F-150. The question to be answeered is why did the fuse blow? Trace your wires on the truck and the trailer and try to locate any bare wires that might have shorted out.

My situation was that I had "crimped" my trailer wire connector and that led to the short.

[bankbuster]

I bought x-tra fuses just in case but more than likely the blown fuse happened from previous owners trailer. After inspecting my trucks wiring it is completely incased in convelutant covering. I pulled my boat for a few miles and lights are still working. Again, thanks for all the suggestions.

[Tyme2fish]

I love a happy ending.