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All, sorry for the delayed response to this thread (if anyone is still following it). The constant power issue has been solved. Long story short, behind the drivers dash panel, J913 was plugged in to P912. (Those should not be plugged in together and are used for applications this truck does...

Thank you all for the replies! Definitely gives me plenty to look at and get me out of this dead end thought process. Unfortunately the truck is parked outside I have no means at the moment to get it in to my bay. Once the weather clears, I'll get back at it and keep everyone updated with the...

Thanks for the reply Ronmar. I will definitely try all that and get back to you. Do you know if the LBCD could still be bad even if it passes all the diode and resistance checks? Would I damage anything if I bypassed the LBCD?

Hello all, I have an M1078A1 LMTV in our shop that is stumping me. When it came in, the driver stated that while driving it had a loss of power and when they went to shut it off, the switch on the dash would not work, so they used the power shut off switch below the steering wheel next to the...