While you are checking everything look at the negative ground. Most ground via the bolts that hold the jack onto the frame. If there is to much rust, corrosion or paint the ground may be bad so current won't flow easily. The extra voltage from the truck or converter may overcome the rust. Pull a bolt, clean the contact surfaces and reinstall.
2017 SLX 195RB
2014 Jeep Grand Cherokee Overland, gas 3.7 V6
Andersen WDH hitch
Dometic Milenco Aero mirrors