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Is it when you first startup the truck?

Well if you had a really restricted feed, it might cause the controller to not see the expected result of an inflate cycle, but so coukd a wonky pressure sensor circuit, or excessive leakage...

Well if it isnt leaking anywhere, then it is probably a pressure sensor, wiring or the controller feeding its 5v reference... or of course the controller itself...

There is only one solenoid. One end of the operable core that moves when power is applied to its coil, has a contactor disc on it, the other end pulls a lever that pulls the small gear into contact with the ring gear. Pretty hard to have motor spin without engagement unless something is wrong...

Yes, but what the dump valves are doing can help point you in a direction. If you give it a shot of air and seal it, a sealed system should be able to set indefinitely. If they are venting air, you are leaking air upstream toward the PCU and the dumps are releasing tire air to match the...

Really a non concern. I have been welding on vehicles all my adult life, never seen it happen. Heard people chatting about it but never anyone who could personally confirm that welding damaged any module… Vehicle ECU systems are quite robust, If welding were likely to damage one, our hundred...

No, there is another connector back by the airfilter that can connect to the crew buzzer switch that clamps on the front of the bed…

Leaks can be sneaky. Pressurizing by applying air to the line coming out of the PCU, then sealing that line is as good as any other way to pressurize the system. It of course takes the PCU out of the equation so does not test its ability to hold air as required… When looking for leaks don’t...

Well that would be a no start, and possibly a no crank(nothing happens). If I read correctly, His is trying to crank, and starter spins, but the bendix is not connecting the starter motor to the ring gear…

Maybe i an not understanding how he is describing wiring in extra batteries, but it does not sound like agood idea... You do not need any "extra hump". If it cant spin the engine, thats one thing, but untill you get the bendix to engage you got nothing regardless of how many batteries you hook...

Mine is a vanner converter equalizer that was basically gifted to me. Victron makes a nice 70A, orion 24-12 that would be my choice as it is small enough to fit in under the power panel, or down behind the kickpanel. Did videos on utube under username Rronmar...

Its a little easier to get in under the cab to work with the compression cylinders and hook up th3 chain plates, but no, you dont have to raise the cab to do this...

this is in the operators manual… The cab air suspension control is in the hydraulic control panel, turn it off to deflate the air springs. the hydraulic suspension compression cylinders are on each side of the frame. Disconnect the chain plate from where they hang stored on the frame, remove...

The trucks used to have kneeling valves on the front wheels. they were spring loaded relief valves, you twist them and they drop the front tires to ~10PSI. That combined with deflating the cab air suspension and the front suspension compression cylinders extended, chain plates pinned to axles...

Dammit Keith! :) The solar is probably keeping the batts in a good place, so your alt has nothing better to do as soon as you start up, so the added load is probably not a big deal.

unfortunately alternators don’t work like that... they are a constant voltage power supply and dont know nothing about battery float voltage. Being a constant voltage supply, all they know is to make rated voltage until the load is so great they are unable to maintain that. I have actually...

Well it is easier to pull a door than to strip out the hardware to hold as spares... Somewhere there is a truck headed to excess with a bed full of stripped doors:)

10-40V… then the signal off of K11 pin 87A should work fine as engine sense. yes you can use surplus alt power when the service batteries are fully charged, but thats the problem, knowing the batts are full, and if you are still running four of the 6T batts, that can take quite a while to...

How many truck batteries are you running? If you have 4, all the output of the 100A alt is spoken for. they really screwed up putting 4 large batts with this dual volt 100A alt(basically two 50A alts in series). The lighting load is half of your available 12v output and any 12v load...

Yea there is no discrete contact closure, K11 would give you 24V. You could use that drive a second relay as well,as enable the alternator to get a dry contact closure. You could also get a voltage sense module to monitor system voltage. When it goes over 13.8V it could provide the control...