before you do anything else, make sure you have a good [enough] battery, do 2 tests, ohms from the battery powercables to the frame of the truck, (must be more than 100k ohms,) and both "at rest" and 5 seconds full back tilt hydraulic stall voltages at the battery. (must not be less under stall than 90% of battery "at rest" voltage, 36.6v at rest no lower than 33.0v at full stall, but needs to start with a "hot" battery of much more than 36.0 v)