Last weekend, I found out that shore power is not charging my battery. 120v, lights/frig, and A/C converter switchs were all turned on the main panel. While on shore power Friday night, I had the battery switch turned to "2", running air conditioner, frig, and left the engine bilge blower fan on. The air conditioner and frig did fine running on shore power but I guess the engine blower fan is only 12v. Over night at about 3:00am my battery ran down and died. I had to switch to both batteries and start the engine to recharge the #2 battery with the engine alternator. As I stated I did have the A/C convertor switch set to "on" on the main panel. I usually set my battery switch to "both" while on shore power thinking it is charging both batteries; I am really glad I didn't do that this time since I could have ran down both batteries dead.
Why did shore power not keep the battery charged? Looking for direction/steps on diagnosing the problem.
Why did shore power not keep the battery charged? Looking for direction/steps on diagnosing the problem.