Sonreir said:Without having the black wire from the R/R connected to anything?
crazypj said:Have you tested wiring harness for continuity? Yamaha were notorious for having bundles of wires crimped together inside harness, one could easily have broken after 35~40 yrs. The XS wasn't as bad as the smaller bikes, they often needed replacement harnesses before they could be sold (un-crate, put a battery on it, do a warranty claim : ) The worst were the intermittent faults, may work for months then just stop. Spent many hours fault finding on Yamaha's (Suzuki's were easy, almost always blown R/R, and stator after owner fitted a new battery without testing anything)
Garc said:So we have battery voltage on the white wire through the R/R following your wiring diagram.
Pulling the power from black signal removes 12V from white.
Going to brown on the field coil with the white wire and green/green creates a spark that blows my signal 12VDC fuse.
Between green and brown on the 3 plug field coil we had 3.6 ohms both ways. We already proved those were the 2 windings.
Is the alternator bad or the Rectifier/Regulator?
crazypj said:There shouldn't be continuity between Brown and ground, until you have the other end of coil plugged into harness
Sonreir said:And that's with the bike turned on and the rest of the wires connected?