I have a bad battery on my 2003 WR450 (10 volts and battery charger will not charge it). I was able to hook up my lawn tractor battery to the WR with jumper cables and the highest charging voltage with the bike running was 13.30 volts at the battery terminals. So Yamaha manual says the voltage should be 14.1-14.9volts. I was wondering what voltage someone else was getting with a good battery.....not sure if my voltage regulator is bad also?
Thanks in advance.