I recently went for a 80 mile ride on my '74 R75/6 in 90 degree temps and when I got home, bike wouldn't start. Usually I just use this bike around town for shorter commuting. Charging light on the dash had been behaving normally. I checked the battery voltage, 12.5V. After putting it back on the battery tender, still not enough juice to start the bike. The lights were dim, and faded to nothing when trying to start. Solenoid just clicked. So I swapped out the Odessey PC680 (2 years old) for the older (5 years) PC925 from my other airhead. The /6 seems just fine now. So I guess I will replace the PC680 with a new PC925.
A few questions for the group?
- Is the PC680 too small for the airheads?
-This PC680 did spend sometime in my other bike last year while the bike was having charging problems (diode board) and had spent significant time in a drained state as I limped home from a long trip with no charging happening. Could this have permanently damaged the battery?
-Could the voltage regulator on the /6 be malfunctioning and overcharging the battery? I don't want to fry the new/old battery that I just put in if that is the case. How best to check this?