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My PCB is bad in m939. I cut open the box and the one wire was burned out going to the one selenoid. Does anyone know how to tell which solenoids bad and as far as testing them? I was gonna replace the bad one or just the whole box if need be. I can post a pic tomorrow in the light. Thanks...

How do you reset emergency fuel shut off. A friend pulled it out, not knowing.

hi. I have a m923. I was wondering if anyone could tell me the proper steps to temporarily bypass the fuel pump? Thanks

Hi. I'm having a problem with the pcb box. It doesn't start. When you turn on the battery switch the selinode for the battery activates. But nothing when the starter switch is flipped. I have all power to lights and marker lights as well to the dash lights. I checked out the wires for the pcb...

I need some thought/advice. I have a m923. Was driving it, all the sudden it died, everything died. I smelled something melt or burn for a few seconds- thinking it was coming from the dash area? To get it home I bypassed the electric fuel pump by turning that thumb screw on the injector pump...

Hi. I'm trying to find the part number for my alternator on a 1985 m923 5ton truck. It won't charge my batteries. They're brand new. If anyone has the part number I would appreciate it. Thanks

Was wondering if it made a difference on checking the tranny fluid? I have the m923 with the automatic Allison transmission. Do you check it warm or cold? I know it needs to be running and in neutral. Thanks for any help.

Hi everyone, my fuel gauge on the dash isn't working. It reads almost empty. Was wondering if anyone had this problem and fixed it or any ideas what it could be? Thanks.

Hi, was wondering if anyone has a wiring diagram for the 12 pin trailer plug on the back of the truck. I wanna jump off that and run a 7 way flat style tv plug. I would appreciate anything. Thanks

Hi, I'm new to 5 ton trucks. Was wondering where the fuse box is located on m923 trucks. Thanks.