My truck is a 1999 F250 SuperDuty, pwr stroke diesel.
My problem is I don't have any current going to my Factory Right side tow
turn signal. Everything else works. Did the flasher go bad?

 

I have a problem with the trailer harness coming partially unplugged from the truck side of the trailer plug. Truck plugs into one side, the trailer plugs into the other side. When you plug in the trailer, check to see if the other side of the connector is fully seated.

 

Also check out the 10 A fuses under the hood in the distribution panel. I don't remember the numbers, but they are listed in your owners manual.

 

I checked the harness and it is fine. I actually unplugged it the trailer connection and tested the all the points and they all work except the right turn signal. All fuses under the hood are good also. Thanks for the info.

 

There are harness connectors located between the spare tire and the tailgate. Check to be sure they're fully seated. They may have been dislodge while removing the spare tire or installing a hitch. I'm assuming the turn signals work OK on the truck.

 

If your truck signal is working check the fuse and the associated relay with it. Also, when the brakes are applied, does the right side still not work.

 

I have checked all the fuses and i have 2 relays under the hood but not sure which one goes to what. All of the harness connections are connected. Turn signals work on the truck and both tail lights work on the trailer. It is just no current for the right turn signal. This is driving me crazy.

 

check the connection inside the plug itself.

 

I got fixed. It had a seperate 7.5 amp fuses for left and right turn/stop signals for the trailer. I pulled the one out for the right side and looked closely at it to see that it was bad. Thanks for all the help and info.