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How do i tell if i have a bad battery? Do I need to disconnect all the batteries to check for a bad one? I ask because there's 6 batteries.

My

My mid-bilge pump is running constantly. When the float is activated, the pump increases its rpm. All the bilge switches are off. Is the float somehow leaking some current to the pump? Rule 800GPH Bilge Pump Rule A Matic Float/Switch (14 Amp, 12-24-36 VDC)

This is my first year with our 1991 sea ray 310, with twin 7.4L engines. I can't locate any drain plugs. Every boat I've had before has had drain plugs on the engines. The guy I bought it from, who was the original owner, always winterized with muffs on the outdrives. I always like to...

I was winterizing my engines and took apart some hoses on the engine. Any idea what this spring is (link is below)? It's a 1991 sea rat 310, 7.4L mercruiset. 1991 sea ray 310 https://imgur.com/a/qQsEZkZ

Nearly everyone at our marina will use shrink wrap on their boat in the winter. At a cost of $400+ per winter I've always wondered about alternatives. Does anybody do anything different for a winter cover?

The buttons on my AC display are a bit finicky and I'd like to look at replacing it. I've attached a pic of what I currently have. Are there alternatives I can use? Can I use a simple household thermostat display?

We have a 1991 310 with 7.4L and Bravo 3s. When cruising, how do I determine the best trim position for the outdrives? I've always found all the way down has given me the best speed to rpm. Is there something I'm missing?

I have some soft spots around the railing fittings on my 310. Are there any recommendations on the best product to inject to fix this? I've seen some various penetrating epoxy like git-rot and others. Does anyone have experience with any of these?

I feel very ashamed with asking this, but we had trouble with our Sea Ray 310 anchor setting this past week. We were in about 10 feet of water and I let out about 40 feet of anchor chain and the anchor just kept dragging. I've never experienced anything like this before, but it was so...

I have a leak in my outdrive trim fluid reservoir. Has anyone had to replace just the plastic reservoir? I can't seem to find anything walking me through this replacement. Also, can the boat be safely operated without trim fluid; as long as I don't need to raise or lower the outdrives? It's a...