While you're troubleshooting the immediate problem you may want to consider the bigger picture regarding AGM's. It takes more than simply replacing the batteries, a complete new charging system is required too. Here is a little more reference material on the subject:
I tried AGM's a while back, did not make any charging system changes from my original flooded cell system (fixed voltage @ 14.0V). My experience was poor at best. After researching things a little more I decided the benefit of AGM's was not worth the trouble and expense of changing the entire charging system to first regain the performance of the original flooded batteries before realizing the further benefits claimed in the advertising copy. For me and my boat usage it just wasn't worth it. It took only one Catalina weekend on AGM's to reach the decision. It was an expensive lesson.
FYI, that single Catalina weekend's experience was eerily similar (dare I say exactly?) to what you reported in your opening post.
I tried AGM's a while back, did not make any charging system changes from my original flooded cell system (fixed voltage @ 14.0V). My experience was poor at best. After researching things a little more I decided the benefit of AGM's was not worth the trouble and expense of changing the entire charging system to first regain the performance of the original flooded batteries before realizing the further benefits claimed in the advertising copy. For me and my boat usage it just wasn't worth it. It took only one Catalina weekend on AGM's to reach the decision. It was an expensive lesson.
FYI, that single Catalina weekend's experience was eerily similar (dare I say exactly?) to what you reported in your opening post.
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