Kind of a long story. Short version is that I was running dual batteries on a Perko switch. One was older, one was very new. Both went dead while sitting less than a week. I found that the newer one had a crack in the case and the dealer replaced it. I charged the older of the two, installed the new replacement, and checked the charging out of curiosity. That is when the question came up because at one time I'm sure I saw 14.5 volts to one of the two batteries, but then only 12.6 or so after that. After installing the new one and recharging the older one I checked all electrical accessories and found that my automatic switchable bildge pump had stopped working. Pulled it and found it had kind of burned up. West Marine replaced it because it was under warranty. Maybe the pump drained the batteries in retrospect. I'll recheck the charging at varying RPM's just for peace of mind. Thanks so much for your advice.
