I have a 1990 Sea Ray 420 with...

[Malbertcfi]

I have a 1990 Sea Ray 420 with  Cat 3208’s. Can anyone make suggestions on batteries both for starting and cabin?

[wingless]

Not knowing the battery size for that boat, my preference is the Lifeline GPL-31XT battery. It is the only 125Ah group 31 battery. I select this one because of the extra capacity.

It works for both starting an house.

https://lifelinebatteries.com/products/marine-batteries/gpl-31xt/

[Malbertcfi]

Thanks. group 27’s that the previous owner installed worked fine for starting, just not for house batteries.

[wingless]

Yes, the Group 31 battery drops directly into the same mounting as the original Group 27 battery.

[MnMwaterlife]

Interstate 8D MHD.. if you have the room..or.. create room.. and I replace old charger(ProMariner) w new ProMariner 63140 ProNauticP Series 1240P 12-Volts 40-Amp Battery Charger.. ALL my DC concerns are behind me..(hope).. find a local Interstate dealer.. I used my buddies Mech shop to get @ Cost no tax.. $208 each