Got it started again and checked the voltages. About 12.9-12.95 at idle and 13.3 v was the highest reading I got when reving it up. My book says it should be 14.5-15 v when at 2500 rpm, so I thought I'd test the voltage regulator. However my regulator seems to be different from the ones in my (Clymer) manual. The ones in the manual have green, brown and black wires. Mine has black, yellow and red wires in a multiple connector and a red with white stripe wire with a separate bullet connector. I can find other ones like this listed in connection with xs650's on ebay, so it seems like it is probably original equipment, but I don't know how to test it. Anyone know about this regulator and how to test it?