Have a Case 586E All terrain fork lift, The Fuel Pump Solenoid wouldn't stay open unless you opened it by hand & then it would stay started. We changed the solenoid & we changed the relays under dash, worked fine. Today the solenoid wouldn't open to start, changed the relays again, checked the wires going to the solenoid & it seems there are 2 grounds (the white /red & Black wires) , Are both these supposed to be ground ?