Tail light circuit burned out from trailer harness

there is no need to guess. at all
insert a ATC circuit breaker in place of that fuse.
then with an ammeter, pull all loads on that feed.
the FSM shows, whats there. log in and read that.
i just looked, F10 in PDC< (under hood) right?
is the trailer hitch fuse.
F10>>>> CB >>>> relay, >>>> hitch.
CB is the trailer circuit breaker.

log in and read, at alldata.com for $15 and not work blind again.

yes, i know books are (out of style)
but do pay back cash.
in saved labor and mistakes and guessing wrong parts.

The trailer connection is usually fed off the wiring from the brake and tail lights If those work, my guess is the wire that goes to ground is open. try following the harness back toward the tail and brake lights looking for broken or corroded connections. If you have a meter or 12v test light try connecting the one end to a good ground if using a meter it should be the black or negative lead. Turn on the running lights and one turn signal while probing the plug if you get voltage or the light to light you have an open ground. Locate and repair the connection.

I have the same problem.

There is a short circuit to ground. I am constantly preaching that it does absolutely no good to replace a blown fuse until the cause of the blown fuse is found. Fuses do not blow for no reason. If you have a blown fuse it means that you have a circuit overload that could potentially burn you truck to the ground. Simply replacing the fuse will only cause another fuse to give up its life to save your truck from roasting. On pickup trucks with trailer hitches, the first place I look for a problem with tail lights is in the trailer wiring harness. They are usually not installed properly. I have seen several of the plug-in type trailer harnesses (the kind that simply plugs in at the connector between the body harness and the bed harness) short internally. You can usually fix the tail lights by simply disconnecting the trailer harness and plugging the body harness back into the bed harness.

If this does not fix the problem, the tail light circuits will have to be traced from the fuse all the way back to the lights to find out where the short is.

With both tail light lenses removed locate the black with yellow wires and the dark green with brown wires coming out of the brake/tail/turn signal sockets.

The black with yellow wire will be the running lights or tail lights and the brown wire from the trailer harness will attach to it.

The green wire on the trailer harness will be the right turn signal and will be attached to the passenger side tail light harness dark green with brown wire.

The yellow wire on the trailer harness will be the left turn signal and will be attached to the dark green with brown wire on the drivers side tail light harness.

The white wire on the trailer harness is the ground wire and will need to be attached to a good ground. Is it pretty easy to crimp an eyelet onto the end of the wire and use a self tapping screw to attach it to the body behind one of the tail light lenses.

Here is a trailer light/wiring article I have done in the past. It has a couple of good tips you may find useful.

http://www.hotspotoutdoors.com/forum/ubbthreads.php/topics/1425999/1/Trailer_Wiring_101

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

you must check the connection where the truck harness meets the added trailer harness on the truck itself not the trailer harness.

When this happens it is usually a bad earth on the trailer.But hey,check the car also.Check inside the trailer lights for a bad connection.It is an earthing problem.Mate.I hope this helps.

Your running lights/marker lights and tail lights are on the same circuit. I all thetruck lights work, the problem is in the plug or plug harness.

I advice you don’t cut into the wiring harness but get the proper kit that is plug and play.

I just bought a wiring adapter from mopar for this. you take off the rear tail light on the drivers side and unplug it from its harness. the mopar wiring kit i bought plugs into the wiring from the car and has two outputs on it. one for the tail light and a longer one that will run down thru the frame and come out under the bottom by the bumper in just the right spot. i has the plastic clips in just the right spots for snapping into the frame underneath too. took me 5 min to install no splicing required. i got mine off ebay for about $20. super easy! good luck!