Code 23 is a posible contactor code. Check coil resistance, should be between 10-15 ohm. Recheck wiring to coils and from coils to card (wires#23 and # 27) to B plug on Card. Contactor tips on F&R contact assy that have high voltage drop across them can cause Code 23 or 24. Code 53 can be caused by tips also during plugging. If you have no forward, check normally open forward tips, and also check normally closed reverse contact tips.