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I believe only a1 trucks have the batt solenoid. There is a battery connection diagram on the inside of the battery cover. Under the spare tire is a polarity protection device. 12 and 24 volt going into the cab have their own leads going to this. 24 volt also goes directly to the starter. It's a...

The ppv wont open unless you have around 65psi. The governor is past the ppv so if you have no horn and wipers adjusting the governor is pointless. I have seen air dryer filters totally clogged up. Sometimes you can unscrew the top cartridge and pull out the small tube filter part and put the...

The port is only available with the Y cable. The air manifold is one in one out. All wheels are just branched off one main feed.

Check the front gladhands for obstructions.

Sticky unloader in the air compressor head is a good possibility. Check under the air dryer see if the expello valve is leaking. Could be related to the governor but every time I have an air issue its usually one of the first two.

If you know which individual wires are bad you can cut and splice to repair. Lots of sharp edges in the lmtv dash it's very possible your harness is rubbed thru somewhere and is still rubbing. The heater hoses can be accessed with the cab open. Maybe you can just flat clamp them off.

All red lights without flashing from initial truck power on is a hardware fault. Bad controller, bad valve body or bad wiring harness. I would swap the controller with a known good one see if any change in symptoms.

The unit is designed to be reprogrammed. The software is a free download from Dana. The Y cable was only available as an upgrade kit that came with a new ctis control and some other parts. The newest lmtv diagnostic kit has a Y cable for the lmtv ctis which should work to reprogram the m939a2...

Driving over cars at the junkyard will cause tire and underside damage. As the cars bend and tear under weight, sharp edges form. I have never had an issue backing up to something in low range. I wouldnt do it under load though. Will

I have a good cylinder too.

Good tested used from a truck I parted. The truck went thru depot maint in 2001

I believe the manifold is rebuildable. Most stuff on the truck is. I do have an extra complete manifold but they are not cheap. Will

I have a truckload pickup in the next few weeks coming from Lockborne going to Stratford CT I95 X32 around 20 miles from the CT/NY border. I have someone who can pick up from the GL warehouses and hold pallets till then. It's 50 for him to pick up your pallet and around 100 per pallet to get it...

No it's just ctis that I know of. 3 separate solenoid actuated valves control air flow in the system. It's very possible you have a bad solenoid and one valve is not opening on command. The system should know something is wrong the pressure sender would give a reading and expect a certain...

I may have one. Don't spray wd40 into it. It likes clean dry air. No hammers either its sensitive. Why don't you make sure all the connections are good. Maybe carefully take it apart make sure there no dust or something in there clogging it up.

Trans and mated transfer case share fluid but I don't know how much stays in the tcase.

The solenoid that opens the valve that sends the regulated low pressure air is probably stuck or not actuating. It's unlikely that someone sabotaged the system. The valve body is a common failure item.

I have not experienced a leak but I believe there are replaceable o rings in the manifold I think the tm shows a breakdown. I use generic replacement o rings for most applications with good results. Will

You might have some dirt in the valve or for some reason it isn't sealing as well as it should? Does the tire leak down over time? If the system can fill air but not drop pressure the issue is more than likely the valve body it has 3 separate solenoid valves set to send different air pressure...

It's a mechanical system that works the same as the M939A2 trucks' ctis system. Once there is around 120psi in the air tanks the system will do its initial pressure check. The system will send air to fill, or send low pressure around 12psi to hold the wheel valves open to allow air to dump...