do you have a electrical multitester? that would make this much easier, and cheaper, so you don't have to keep blowing fuses to see if it is right.
if you have one or can get one, set it to continuity and test the main power wire against the ground. it will probably indicate a connection which is why you are blowing the fuses.
take the power wire off of the cap. and then check for continuity, if it still says there is a connection, or if the fuse blows again, the main wire is pinched through the insulation somewhere causing it to ground out and blow the fuse.
if all is good, then continue on down the line disconnecting each part of the system and testing again. this should help you narrow down where the problem is.
also, try disconnecting all of your grounds, then test it also. this will check to see if there is a problem with your wiring, or the equipment.
any other questions just ask