| I think its likely from what you say that both the alt and reg/rec are duff. As you say you cannot check the reg/rec with a duff alternator (except putting it on another bike) though blowing fuses with a reduced alternator autput suggests it is faulty. Thus, if you are convinced the wiring is OK then you should replace the alt and recheck. If the unregulated output is OK but you still do not have good charging when you connect the current reg/rec then replace the reg/rec and try again. My understanding is that the 3 phase reg/recs will work fine on only 2 phases (try searching the forum).
Dunno how the reg/recs are wired internally but in cars the light comes on when alternator output is less than battery voltage. This could be due to either weak alternator or failed reg/rec so the light coming on doesn't help you much. The fuse blowing does suggest it is faulty though if the wiring is OK.
Keith |