Turn Signal relay location on a 2013 Petrbilt 386

I lost the turn signals during a really heavy Thunder storm. The roadways were flooding and I went through some pretty good puddles. Think I might have got water some where anf that could've caused it? Thanks again Goodysnap. You're a real life saver.

 

I'm trying to find the fuse to the right-turn trailer circuit on my 2012 386.
I took it to a shop to have a broken wire in the harness feeding the trailer receptacle. I think the guy shorted the wire when he was repairing it, and blew a fuse. The wire is dead. We had to run a jumper from a tail-light as a temporary fix. Peterbilt says that each circuit has a fuse.
But WHERE?

 

RT trailer is under hood fuse box G6. Power in is Node connector C pin 19. pin 20 is output.

 

Does anyone have a wiring diagram or something for the signal lights for a 386? I have a couple 2010 386 and the left turning signal doesn’t work on neither the 4 way hazards or the signal its self. I swapped the switches on both and the switch is fine. I check the fuses on the kick pannel and under the sleeper and its all fine too. All the lights work but the signal won't work on either the tractor or trailer.

 

All lighting fuses are located in the underhood PDC driver side.

Anything labeled G followed by a number is chassis node input power for exterior lighting.

 

Peterbilt 386 , front right signal, and tail left signal are not working. All fuse are good. What else could be wrong?

 

You likely have an open, green wire on the chassis node input for that circuit. Inspect the wiring under the left front of cab near the cab mount and the underhood PDC for rubs and potential corrosion. Also inspect the wiring and connections at the chassis node itself. Beyond that your gonna need diagrams to trace out the circuits.

 

Usually when a bulb is out, I got a code , now I got no codes , no warnings

 

Goodysnap, you really seem to know your stuff on this subject.
I've been chasing a gremlin for the last couple of days with a pete 386. I read through all the previous comments and have noticed similar issues. If I have both front turn signals plugged in at the same time they will quit working and Flash one time every thirty seconds along with the right rear turn signal. And repeat. But, If I unplug one or the other front turn signals everything seems back to normal. Doesn't matter which one I have unplugged, I get the same results.

I'm usually pretty good at figuring this type of stuff out but it's got me kinda stumped. Any ideas? Open green wire would give these results?

Thanks

 

You definitely have something going on that the CECU doesnt like. I cant say that I have ever seen this exact issue so no silver bullets for you. First things first, I would check all three connectors at the chassis node and inspect for any corrosion or melted/corroded pins. Next I would check all circuit grounds to both the Node and the CECU. Main cab grounds at the LF cab mount.

Does it act the same when you disconnect one of the rears or just the front?

PM with private email and I can send you diagrams and Node pin out if it helps you. Please provide last 6 of VIN.

 

GoodySnap, I have a 2012 386 PB w/ an ISX: I had the head replaced and now the marker lights , signal lights or Headlights will not turn on at all. I have traced wires all around and can't find the problem... would it be that the Chassis Node just quit? If I put my 12v tester tip to the marker clearance lights relay while its plugged in i get the marker and signal lights to turn on. Whats going on? I replaced the 4 batteries cause the others were dead ( head job took forever , wasn't in a hurry).