Imagine that, alternator or starter ( see post 46); King Happy, put all the wires and fuses back, start your car at idle and check A/C voltage across positive and negative battery terminals. That should be ZERO; Anything above zero indicates bad diodes = repair or replace alternator. 2nd test: place test light in series between positive battery and cable, If light goes on there is a drain. Then disconnect the wires on the alternator. If light goes out the alternator is the problem; Again repair or replace alternator.