You got it Brother. Glad it worked out. Sometimes just cleaning does not work. $700 Sam chassis and has to be programmed at Freightliner while installed on truck!
Blue Wire from truck to trailer in light cord always hot
Discussion in 'Freightliner Forum' started by habfleet, Aug 30, 2017.
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On my truck the center pin is always hot because of trailer tracking. Not sure if that was done to your truck.
QUALITYTRUCK Thanks this. -
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 trailerpower , You can break the middle prong and try .
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Rdorsey28, For your constant power on trailer abs circuit. You need to check your R8 relay on the SAM Chassis. Your should have a 4 pin relay in there is you want abs power on with key on only. If you put a 5 pin relay the power on the ABS circuit will be always on.
Per SAM PIN layout wall chart " Pin 87 or pin 87a will be missing depending on the functionality of the circuit. If prong 87a is missing the circuit will be normally open, the trailer power circuit is enabled only if the key is in the IGN position or enabled through a switch (depending on SAM parameterization). If prong 87 is missing, the circuit is normally closed (BAT). If a 5 prong relay is used, the trailer power will always be on." Please try a 4 pin relay and update the forum with your results so all can learn. -
Rdorsey28, Rocketyman back in his August 31, 2017 post explained this and actually posted a picture of part of the wall chart with the explanation of R8 relay in your SAM CHASSIS. So please look back on the thread, I missed that it had been posted earlier.
bullhaulerswife Thanks this. -
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