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Put the manual valve by the tanks and just get out and switch it over when you need to. I have the manual valves from m939 trucks.

Add a new ground wire from the batts negative to a sanded spot on the main frame rail. Alt ground strap. Polarity box connections. Alt terminal connections. Could be a bad voltage regulator.

I have a few nos real spicer ones left and some nos valves. The midwest ones are china copies. The small hose that holds tire air isnt armored like the real ones.

If the truck drives straight and there’s nothing wrong with the steering components take the steering wheel off and re center it. If you need an alignment places that do fire engines can usually do it.

Its hard to visually see sometimes but the radiator fins can get clogged up with dirt and debris sometimes a good pressure washing clears it out.

Maybe the starter going bad

If you take the line off the tcase that goes to the scav pump once the line is off you can unscrew a catch screen. Look there for debris.

Maybe shorted trans tcm. Behind passenger kick panel. 3 plugs just unplug them

So you have a newer truck with data bus and you plugged in an older style controller and burned out the bus resistors. One under the panel and one in the engine bay drivers side. I have the correct compatible controller if you need one.

Check the front blue gladhand cover make sure its venting free. If the truck has been sitting for some time you can also have a stuck brake pad. Usually on the rears though

On that truck that’s what it is

3116 truck wtec3 allison only diagnostic port

So you have never seen it run? If no trans display someone probably cooked the trans tcm trying to jump the truck with dead batts. I have a replacement here. If its 7 year old fuel and fluids I would drain and replace it all. Flush back the fuel lines and probably replace the lines. Definitely...

The -24p tm should show a full breakdown. It may be in the second volume

If the potting is cracked or studs are loose the box will need replacing. If not you can wire brush the terminals and they should be fine.

You need to bolt a new ground to a sanded spot on the main frame rail. Other spots may not work

The main ground goes thru a current shunt the connections deteriorate add the new ground

Bang bang bang of the starter? Add a big ground cable from the batts negative to a sanded spot on the main frame rail.

Check the vent line on the pcu case make sure a bug didnt build a nest

The blue is harness to cab bulkhead. I have them new. You need to check your cab to trans harness see if it looks the same