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Old 06-08-2021, 08:41 AM   #1
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I'm going to replace my batteries in my 2006 Maxum 2200SR3, dual battery set up. Last trip out after a day on the water it started but had a slow crank. I just bought the boat so I wanted to start with fresh batteries. Just wanted to see what size I should be putting in. Thanks!
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Old 06-08-2021, 10:40 AM   #2
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Batteries were installed by the dealer when the boat was new, so you’ll have to look at what size you have now to be certain the new ones will fit your boxes.

Did you leave the battery switch in ‘Both’ while on the lake? The purpose of a dual battery setup is to isolate the starting battery from the house loads so you’ll have a fully charged battery for starting.
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Old 06-08-2021, 05:32 PM   #3
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I had the switch on both while under way, but when I was stopped I had it on one. When I went to get back under way I switch it to both and that's when I got the slow crank. I also notice that while on one when I was sitting there wasn't enough in it to even run the radio, so I'm thinking I'd rather just replace both for peace of mind, just gotta figure out which group. Last thing I want is a battery issue out there.
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Old 06-08-2021, 08:50 PM   #4
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You should have a starting batt and a deep cycle house batt.

My set up is like this:

Pos 1 - starting batt
Pos 2 - house batt

Put it on pos 1 to start and run (both batts are being charged)
Put it on position 2 when stopped and back to pos 1 to start and run.

I have never use Both. That is for emergencies only.
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Old 06-08-2021, 09:41 PM   #5
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Gotcha, this is my first two battery set up so I'm definitely still on the learning curve, much appreciated. What group number batteries are you running?
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Old 06-08-2021, 10:21 PM   #6
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I have group 27's but go as big as your trays will allow or if room, add larger trays.

The whole purpose of the switch is isolate the 2 batts. using BOTH will draw them both down.
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Old 06-08-2021, 10:46 PM   #7
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Thats what I was looking for! Thank you!
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Old 06-09-2021, 01:11 PM   #8
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Looks like I have two cranking group 24 batteries in there now, the one being a 625 cca. According to the book it says it needs 800cca. Batteries are also small for their trays so I'll upgrade to the group 27's, probably Interstate Marine cranking and one deep cycle. How can I tell which battery is on position 1 and which is on position 2? I have one battery closest to the stern and one perpendicular that is closer to the bow.
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Old 06-09-2021, 01:12 PM   #9
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See picture below:
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IMG_7899.jpg  
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Old 06-09-2021, 02:56 PM   #10
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Disconnect the NEGITIVE cable from one battery and turn switch to #1 position, turn on any light or try and crank engine, that battery will be either #1or #2.
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Old 06-10-2021, 10:48 AM   #11
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Perfect, thanks!
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