550H cant do much about the voltage on that sheet cause bike wont run, and i cant not have the headlight be on either. i blew up the diodes diagram but not able to see clearly, Rooster, WITHOUT the charger on 12v at the Bat and 10V on the R/W to Bk; WITH the charger on I have 14V at the battery and 12.0 from R/W to Bk all this with the 'new' regulator i just got from ebay. i tried all of the TCIs i have (3 of them), and still no hint of a spark happening with it cranking a million miles an hour. the bike shops in bellingham: 1st one said their mechanic isn't coming back cause he died, and didn't want to work on my bike until maybe october when he had nothing else to do. the 2nd guy said go away and part out your bike, it's too old. i checked the continuity of all white wires and the green and brown from the TCI to the next connector and wires were good. wondinging about how much i could make parting this out. tired of working on it.