Just thought i would share my findings here.New coils arrived along with new all-in-one rectifier/regulator so thought i would try it all out.First off i found that the existing rectifier that should have had a connector-conector had been removed and all wires from that were bared/joined together!so new conectors are needed there but in the meantime ive fitted spades and taped up.i tested the battery before startup and it read 11.70 volts,after startup it read 11.30 volts and no amount of revs changed that.i took a reading at the black wire for the regulator and find its slightly less than that of the battery by half a volt.connecting that to the new rect/reg unit and nothing comes from the white wire.i put the black back onto the original reg still on the bike and get a reading of 10.70 from the white wire terminal so connected white wire to original reg and am now reading 12.3 volts across the battery at 2000rpm.so although i first read a short in the alternator,its charging using new rectifier and old regulator! any thoughts welcome...should i run it with new rect/old reg? the new unit came from ebay and stated it was for the 550 four