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. Penetrating oil for several days. It isn't great but I try the screw, apply more penetrating oil, try the screw again (and so on). .

. Crank the truck. Air to full, then off the truck. Maybe you can hear it or maybe note. Get a spray bottle and use dish soap and warm water. Spray everything in sight that looks like an air hose or air line. Start up front with the glad hands at the bumper. Get the lines behind the grille...

. What about all 4 batteries as individual batteries? .

. Just because... Why don't you use a multi-meter and measure all four batteries? No need to disconnect anything. Just meter plus and minus on each battery. Possibly record those measurements here if you would. These trucks are notoriously "over batteried" and under charged. Strange things...

. If you want parts or testing of your existing controller, @Suprman is a good point of contact. I have bought several things from him over the years - and he has been helpful and reasonably priced...