Need help with 03' 340 Battery Charger

[Blacktip]

My batteries kept dying on my boat, so I bought 4 new interstate 27 batteries, which were the ones that came with the boat from previous owner. I went back to the boat and noticed the Coolmatic RPD-110 DC fridge wasn't working. The fridge is wired to a blue capacitor and to the power cables that go back to breaker panel. Used voltmeter and saw it was not getting 12V DC. It was reading 10.8 VDC. I checked the port batteries and they were low too, weird because these batteries are about are less than two weeks old. At rest port batteries read 12.18V with no load. I checked the charger and power going in to it reads fine but DC coming out is 12.3 DC. I thought it's suppose to read 13.5VDC if properly working. I also saw boat did not have original battery charger. It currently has a Charles 15amp charger. OEM is an Intellipower 40amp. Would the lesser amp charger be the cause for the battery not charging? Starboard batteries is at 12.49VDC at rest. I believe the fridge is wired to the port side battery. I also had to parallel start the port engine to crank because I was getting the dead battery sound.


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[JimG]

Sounds like your charger is bad... it should be putting out 13.8 - 14.2 VDC The lesser amp capacity charger should still put out that range of voltage.

 

[paulswagelock]

Sounds like the 15 amp charger is undersized to cover DC load and charge the batteries. I would think a 4 battery boat needs a 40 amp minimum capacity.

 

[wayne0]

Sounds like your charger is bad... it should be putting out 13.8 - 14.2 VDC The lesser amp capacity charger should still put out that range of voltage.

This. Charger output is too low.