have you tried jumping the master with a peice of cable see if cart runs? just because its clicking dosn,t mean its good..........as for the 5th one ( right side ) try putting cart in reverse see if it clicks as that one is for reverse.......as well as 4th speed......and lastly you say your pretty certain micros are good? all the work you did take the box off take it apart and check them and the plastic slider......there are 5 stacked in there 1 for each solenoid........1st though since master clicks jack rear up and jump large post see if cart runs......................................