can you post a picture showing the conection area?
if it has three big hook ups on the top and the one in your cart now has 4, you can eliminate the short A2 wire from the F/R switch to the controller. Then you just need to be sure the small wire hook ups are compatable (same number of pins to wires ect...)
If I understand you right, this is what you are wandering?
Someone double check me on that info, I don't want to lead you astray