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Old 06-12-2015, 02:06 AM   #1
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Default scr battery selector

On our maxum scr 2400 there is a battery selector switch that marked for 1, 2 and both. It is my understanding that this selects the battery that is powering the electrical system and also selects the battery that will receive the charge from the system. What is the proper use of this, do I start the engine using both then change over to one or two after the motor is running and after the boat is underway what setting should I have the selector on?.
I don't want to discharge a battery and fail to set the selector to charge it back up.
I don't have a manual on all this stuff otherwise I could read the book. The owner took great care of the boat why he didn't have the owners manual on this stuff bests me. Thankfully this forum is here with a brain trust of boat owners willing to assist those of us new to the larger boats. Thanks for the assistance in advance
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Old 06-12-2015, 03:11 AM   #2
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I start and run on one battery then switch to the other the next time I go out. This way they see equal use and get charged on a regular basis. Since I am in a rack I do not have shore power to use the charger.

I would only use the both position if I was stuck with two low batteries.
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Old 06-15-2015, 03:31 PM   #3
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if youre docked with shore power I would install a 2 bank charger if you don't have one already. that way both batteries are being charged regardless of what the switch is set on. From what I read you don't want to select "both" on the switch when charging. If trailering just do what MMWJR stated.
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Old 06-15-2015, 04:15 PM   #4
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The best answer would be to install a battery isolator, so both batteries charge from the engine regardless of position, then run on one battery and keep the other as spare.
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Old 09-03-2015, 11:03 PM   #5
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I hate to reopen an old thread, but I have a question. When I purchased my '04 2400scr, the old owner advised me to keep my selector in position 1 and only use position 2 if there was an issue with battery 1. I have had 2 batteries die in about a year and a half, both in position 1 and both while on shore power. Each time, the boat had been docked for over a week and had some sort of constant power running (the first time I had left the refrigerator on, the second time I had left my nav lights on). I am curious if I may have an issue with my battery charger, since my batteries died while connected to shore power? Any guidance? Thank you!
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Old 09-04-2015, 12:18 AM   #6
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While on shore power was the battery charger breaker switched on? If yes is the charger connected to both batteries.

I always turn my switch to off as do not keep the frig on, however it should be a dual volt frig that automatically switches over to shore power when plugged in. Was the main breaker on?

I switch between the 2 batteries every other trip to keep them charged.
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Old 09-04-2015, 12:30 AM   #7
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Thanks for the response. Yes, I was on shore power and the breaker was switched on. I had the battery selector in the 1 position and that was the battery that died. I just brought it to Autozone to be tested and it was completely dead
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Old 09-04-2015, 12:35 AM   #8
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Load on battery had to be higher that chargers output.

Have you tested the charger to be sure it's working?

You may want to install a ampmeter to see what the draw is while sitting in its slip. Also are you using deep cycle or starting batteries? Starting are not designed to be discharged like this and will be damaged.
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Old 09-04-2015, 12:37 AM   #9
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Dead as in discharged, or in needs to be replaced?
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Old 09-04-2015, 12:40 AM   #10
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I have yet to test the Charger to ensure that its working. I was planning that for the morning! They were deep cycle batteries (27's).

Kevlar7r, it was dead as in, had to be replaced
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