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One of the tms has a good clear diagram

When you start the truck, hwy should flash until there is around 100psi in the tanks. At which time a pressure switch closes and the system should do an initial pressure test and decide if it should fill, dump or do nothing. If the hwy light only flashes onces when you start the truck and no...

I think it was 2 lines that went from the cab pass thru to the 3 valves under the drivers area.

Does your generator have a mag pickup on the flywheel? You can bench test an actuator I use a variable power supply. Usually around 5 volts they start to move. Some of the controllers won’t open the solenoid until they sense a certain engine cranking rpm. If the gen wouldn’t start and someone...

Is the controller missing too?

I dont have one on hand right now but its a standard 2 wire isuzu actuator. You can call drash and get the manual. Just need the serial number. Drash is good with support but they dont want manuals posted to open forum.

You have to replace it.

Take the adapter off the front of it. Thats 2 pieces.

The military cylinder is not rebuildable. And they are few and far between. The tractor supply mod seems to be a good idea.

The line from the fuel tank to the primer pump is a common culprit. Parker shop can make one. The hand primers also get dry inside and crack and suck in air.

Neutral relay is in the vim

There are allison pinouts online. Have you by chance opened up th vim module there are relays and 2 fuses in there. It’s behind the passenger kick panel.

Prevents cab electronics damage when someone accidentally installs batteries backwards.

What do they measure at the batteries? Its either connections or bad batts or the polarity box under the spare tire. You can meassure voltage in and out of the polarity box to see if its bad. You should only see around 1/3 volt drop thru it.

If you loose your ground nothing will work. Are you sure your batts are good?

Maybe a ground issue. Run a wire from the pdp ground lug to the negative on the batteries. The main grounds meet at the starter I believe. They can loosen up. You can also get corrosion on the panel contacts. Sometimes taking relays and breakers in and out can clear up contact issues. There is a...

I have the second gen heads that go in the cab. They are a bit larger than the stock heater box and I believe you have to run a 12v power lead to it also.

You can take the schrader valve out of the wheel valve air stem and screw it into the wheels valve stem.

I would check the entire harness. Especially where it comes out of the cab, drivers hump behind the grill. The plastic insulation gets brittle and cracks allowing wires to intermittently touch each other or ground.

It’s easiest to take the hose off first. Then the adapter piece and then unscrew the elbow from the stem. Sometimes the adapter piece loosens first and comes off with the hose but no big deal if that happens. I think the earlier style with the elbow as pictured is a bit sturdier. If you break a...