I have a 2019 122SD and the trailer lights are stuck on. I know that it is not the trailer. I’ve used multiple different trailers and I get power at the trailer plug with no trailer attached. The “Johnny arm” functions and when I engage it I hear the relay clicking. Does anyone know where I should go from here. What do I all need to check?
Trailer brake lights stuck on.
Discussion in 'Freightliner Forum' started by Diesel13230, Nov 30, 2023.
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Did you try a new pigtail?
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Tractor protection valve should be at the back of the cab, follow from the gladhands to the other end of the air lines.
What about the tractor brake lights, they are ok?.
Your problem is most likely the switch is stuck.Rideandrepair and Diesel13230 Thank this. -
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Attached Files:
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You might have a stray wire making contact with the brake lite circuit.Rideandrepair, Big Road Skateboard, JB7 and 1 other person Thank this. -
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