After reading many posts I couldnt find a similar problem. My lights went out on my trailer. To avoid any problems I ran all new wires and now I have a few problems I thought I was avoiding.

When all wires are connected I get blinkers. No matter the left blinker or right blinker both blinkers on trailer blink and I get no running lights or brake lights. All lights on my truck work correctly. Any ideas where to start trouble shooting?

 

The wires on the pig tail (trailer side more than likely) are incorrectly connected. Your turn brake lights travel the same wires as your turn signals. You should have one wire for tail and clearance lights. One for left turn, one for right turn. One as a dedicated ground wire.

Good luck

 

4 wire?

6 wire?

7 wire?

make sure you have a ground wire running to both the tow vehicle and trailer, and that both sides of the connection are mirror images of eachother.

 

If it's a four wire flat connector, the white wire should be ground.
The brown wire is running lights, not only clearance and side markers, but also one of the filiments in your trailer tail lights.
Green is the right side turn and brake.
Yellow should be the LEFT side brake and turn light.

All of these lights will have a white (GROUND!) wire connected to one side of the socket, to the reflector inside, or a center connection between filaments.

The TAIL LIGHTS each have three wire connections - the turn/stop/tail lights have two filaments each connected to a ground wire that is between them. One filament connects to a turn and brake wire, the other filament connects to the brown marker/running light wire.

Marker lights are pretty simple, but because of the dual-filaments in stop/turn/tail lights, getting the ground wire connected in the wrong place can cause some serious bad and strange things to happen with the lights.

Below is a simplified diagram

The most common disasterous mistake with tail lights though, is to accidentally get one side connected one way - and the other side connected different. When that happens, what it does is connect circuits that have nothing to do with eachother together; such as the running lights and ground, or something similar! You definitely don't want that, because it can short things right out...

That's what I think has probably happened.

Out of all the lights on your trailer - the turn/tail/brake lights are the most likely cause of what you've described - and the cure is to check the connections over carefully.

In point of fact, you can wire any of the plain old marker lights EXCEPT those 100% backwards, and it won't matter unless instead of a wiring harness ground they are grounded by being screwed down to the metal frame of the trailer. (a lot of them are, so take a good look at them)

~By the way, check your fuses! If you've grounded the marker lights, you can expect one of them to be frankly black and fuzzy.

And many ford trucks have seperate fuses from the truck lights that are only used for trailer lights. That might explain why they don't come on now...

Those fuses are usually an odd size: 4AMPS. The most common location is in a fuse box on top of the left front fender liner. They are the 2-blade style, and I seem to remember they are color coded green. - and yeah, I seem to remember 2000 year model trucks were some of the ones set up that way.

 

Thank you! There was blown fuses and the actual 4 way connector on the truck side was bad. Switched it out and everything is good.