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Thanks Markrsimon. Don't know the age of this battery. Probably old. Three main batteries are only one year old. Charger was recently professionally installed, correctly I assume. Having the genset serviced or repaired soon I hope. Should clear up the battery problem. Thanks again.

I am having a battery issue with my genset. The three main batteries all new within the last year. I had the original charger replaced with the ProMariner Pronautic 1220P smart charger this Spring. Now the genset battery cranks slowly to dead. Also, the non-starting genset is not working and...

Thanks hottoddie

A little off topic, but which type of refrigerant does my Cruisair AC/Heat have? I assume it is R12, which is obsolete or very expensive.

Got it. Will keep this info for next Spring. Thanks.

Good tip. But I have a feeling mine never stops charging. Will investigate further next season.

Many thanks. Will check out the 1230P.

Thanks, which model would you recommend?

Three batteries. So two banks with two batteries together in parallel. The two together say Group 24 675MCA. The single battery, I'm not sure at this point as the boat is in storage now.

I have an original battery charger, I believe, on my boat. It has a meter which never moves from zero and the cabin panel light says it is always charging. It's either always charging or never charging. I replaced all three batteries over the past season. I think it is time for a new...

Disregard post. The alarm was coming from old CO detector. Replaced with new one. All good.

Turning on my cabin light switch at the helm now causes an alarm to sound. Is there a short somewhere?

Yes, good advice. Wonder why my batteries are not sealed though? Maybe my mechanic used cheap ones.

Thanks, I will look into these Pronautics.

Thanks, Wylie. I agree a smart charger is the way to go.

My 1988 340 Express Cruiser seems to be cooking my batteries. The shore power converter light (green) on my cabin panel never goes out. Most recently replaced battery looked like it was only 3/4 full of electrolyte. Do I need a new charger or a smart charger?