2013 FREIGHTLINER CASCADIA TRAILER AUXILLIARY POWER?

Mateocargo · Mar 28, 2019

ast26909 said: ↑

I have no 12V power on the center pin at trailer plug, found no power at 30A 'trailer power' fuse and 'trailer power relay' missing at SAM chassis module. Install new relay, I now have power at the 30A fuse but still no power to the center pin. I have verified the trailer cord is good no wire break between the center pin and the other end of the wire where it plugs into the truck wiring harness. There is a break in the circuit from the SAM chassis module to the trailer cord connector, hopefully someone has done this before and can share their experience? I really need a wiring diagram for this circuit.
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Did you fix the problem ? I have the same problem

ast26909 · Mar 29, 2019

Mateocargo said: ↑

Did you fix the problem ? I have the same problem
Click to expand...

No, not yet. The wiring diagrams from Freightliner seem to be incorrect I have not had time to figure it out yet. Does your truck have the trailer PDM?

Gursandeep · Jun 26, 2022

This might be very easy fix. Trailer power relay must have 4 prongs (legs) if it has 5 then trailer will keep getting the power even if key is off position. If you have 5 prongs on the trailer power , You can break the middle prong and try .

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