Airhead Dyna Charge Monitor
A while back I had the misfortune to have a dead battery in a grocery store parking lot in Moab, Utah. The bike had been blowing fuses every time I tried to use the turn signals, and after putting up with it for the first few days of a two week vacation, I just left the burned out fuse in place. I didn't have any dash lights or turn signals, but otherwise the bike ran fine. But when the battery went flat, I knew there was something else more seriously wrong.
A bump start got the beast running again and back at the motel Mail Box Bruce let on as how the alternator wouldn't make much charge if the alternator warning light wasn't coming on. Seems the current to the exciter coil of the alternator runs through the warning light, and if there's no exciter current, there's no juice for the battery. So I ripped off the tank and started poking around looking for the short circuit. I'd been having problems with the electric grips since Baja, so those were the first to be disconnected. The turn signals worked fine until the bike was started, and then the fuse would pop. I went on disconnecting and checking, even going so far as swapping out the warning light assimilator with one from Gene's bike. No joy.