Sounds like you are bumping around in the dark.
The solenoid is an on/off switch.
The small terminals activate contact between the large terminals.
It takes a 36v positive to 2 small terminal and a 36v negative to the other small terminal to activate the contact between the 2 large terminals.
The micro-switches are on/off switches for half of this activation circuit ( I think it is the negative side) It doesn't matter which, the other side will be a constant. that is the wire that loops from solenoid to solenoid (yellow?). See if it is positive or negative... then take a jumper wire or the other polarity and test activate the solenoids in question.
TEST ONLY WITH THE CART ON JACKS, REAR WHEELS OFF THE GROUND.
If you have micro problems ( solenoid not activating.) Check the F&R micro first.... then, Disconnect the gas peddle linkage from the box and remove it from from the cart. Slide the micros out and check each one for continuity and a good clear "Click"
