He beat me to it.
Motorcycle batteries are a bit different than car batteries. Some can't hold up to the vibration these bike put out. It's not uncommon for the cells to be shorted together, and still read 12.8 volts. I've seen this many times. With the older EHC's , there is no protection between the battery and the EHC. This is why we recommend the Deka battery. ETX20L 310cca. If you are not running this battery, you will be money ahead to start there. 9 times out of 10, this is most of Bid Dogs electrical problems. It's not the EHC, or wiring. Most of my customers are still running their original EHC, we just change out the charging system, and battery.