rah6965
Member
I need some help with my F150 trailer wiring. I am in the process of re-wiring a trailer and I hooked the new 7 way RV pigtail for the trailer to my truck trailer plug. I installed a brake controller with no problems but when I was trying to identify the function of each wire in the new pigtail, I couldn't get the turn and brake wiring to work. All the other 5 wires on the plug work perfectly, but I don't seem to have any brake light voltage or Rt. and Lft. turn signals. I first looked at all my fuses on my truck to see if any of them were blown, but they all checked good. I then disasembled the trailer plug on my truck and looked for broken or damaged wires in the plug. Other than a few small nicks on the wires, the plug looked good. I taped the nicks and replaced the plug. The brake and turn signals work fine on the rear of my truck. Doesn't the trailer wiring splice into the truck wiring? I inspected the wiring up until it merged with other wires going into my frame and didn't find any problems. It seems odd that both my Rt. and Lt. turn signal/brake wires would go out together. Is there any other relays or flashers that could be causing my problem. I don't want to dig into wiring harnesses in my frame, if I can help it.