www.iFourWinns.com

Hi all i am a new boat owner. I have a 1999 Horizon 220. I bought it in Feb of this year. Everything has been going great untill the 4th of July weekend while on a week vacation on the lake i noticed that my batteries werent recharging while out on the water. I figured it was the alternator so I charged the battiers overnight every night so we can spend the day on the water. Onc ei came home i had my mechanic check out the alternator and it tested fine. The gentlman i bought the boat from replaced both batteries for me ( so he said). They look like new batteries so i am assuming its not the batteries. I did however replace just the radio head unit and nothing else. Im not sure if the new radio is causing the issue. So i disconnected the radio and have th ebatteries charging untill next weekend when i take the boat out again. I hope that by disconnecting the new radio it fixes the problem. In the mean time has anyone else experienced an issue where there batteries didnt recharge and alternator tested out ok?
Please Advise.

You can take the batteries to Autozone, etc. and they will test them for free. Also be careful how long you leave them on a charger as you could boil them...

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2003 Horizon 240 With 5.7 Volvo Penta

With the engine running, do a voltage check at the battery. Your charge voltage should be about 13.6 to 13.8 volts

Are you using the boats on board charger? If so, it should be a 3 stage charger so it should not boil. Plus, the charger lights my also tell you the condition of the battery.

You mentioned the new deck, I don't see it being the problem. BUT, you should be turning your batterys off when leaving the boat. If your not truning them off, your deck and Co2 detector (or anything else that is on) will in time bring your battery down.