No right side trailer signals, left works, checked at the plug, dead there. As I said, left works right doesnt, truck works. Are there separate fuses? Where r they located? Checked the dash fuse box, nothing marked trailer signal, nothing in the b pillar?
2012 Columbia, no trailer signals
Discussion in 'Freightliner Forum' started by Elroythekid, Oct 19, 2021.
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Need to investigate wiring further upstream of 7-way.
Post last 6 of vin and I'll give you schematic.Elroythekid and Bean Jr. Thank this. -
Bt2084, wiring looks good all the way up to the loom under the hood. Cant find trailer signal fuses? Trl marker and tail in main box pass side dash. Only trailer fuses there. Called my local dealer, they had no idea. No trl fuses in b pillar, no box I can find on the firewall?
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Okay. The PDM has circuit breakers and relays. Sometimes these do go bad, but I'm thinking it's only your TRAILER right turn signal that is not working...?
You have a couple intermediate connectors before they go to the BH connector on the FW.
Per your configuration, your 7-way wire colors should be like this:
Pay attention to connector orientation:
The intermediate connector should be located somewhere in the RH frame rail:
They'll look like this in the frame rail:
The connectors are labeled as such:
That harness runs up the frame rail and into the BH (youre looking for 30 pin connector):
You are looking for CIRC 38R for the right turn signal. Can you answer if it is only the TRAILER signal that doesn't work?
Lets start here. Next we can dive further if necessary.
280Elroythekid and QUALITYTRUCK Thank this. -
Are there fuses for the trailer signals? I certainly cant find them. I was hopeful that was the problem -
You have relays and breakers.
Since it is ONLY the trailer lights, it makes me think it is the intermediate connector in the frame rail (could also be a splice--but lets not worry about that yet). Did you inspect this yet? If the tractor turn lights are working fine, then there is no need to worrying about any breakers/relays--granted everything is stock.QUALITYTRUCK Thanks this. -
Relay that controls the right side turn signal.
Located on cab chassis controller on firewall.
Tap it or push on it. Hope it's note the board. $2K. -
I wanted to go over it o e more time and check all fuses etc. I opened the door in the B pillar, none of the fuses are marked trailer, I checked it all again, I t was all good, but when I looked at the trailer I had flashers. So, closed it all up and had none. It's something in the PDM. I couldn't get them to come back in, so I spliced a line into the trailer cord from the side blinker on the tractor and off I go. I ordered a PCM from my dealer back in Dartmouth, he found one. I've had trouble with that when I first got the truck the cab was leaking into it. I dried and cleaned it, maybe it's time. It's not an expensive fix so I'll try that first when I get home in a couple weeks. The cover is missing so maybe it was labeled differently?? If not I dont have brake and signal fuses separate for the trailer. -
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@RocketyMan The PDM in the B pillar has nothing labeled trailer, could it still control the trailer signals and brake lights? They are the only trailer fuses I haven't found? Or do they just come of the regular signals and brake lights?
How would i find out?
Your diagram it looks like the trailer cord goes up the right chassis rail, mine looks like it heads up the left side?
It's a glider kit, would that make a difference?
Thank you for all your help, last couple days have been hectic, new job and all, and after all the calls I've made and heard back from zero of them, you actually answered and gave me info, cant possibly thank you enough.
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