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Old 08-31-2015, 06:51 PM   #1
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Default battery selector issue 3100SCR

2002 3100SCR

I have 2 batteries runing in parallel in battery position #2 and a single battery in battery #1 position.

I have 2 battery selector switches. House (1,2,both,off) and Engines (1,2,both,off)

I removed battery # 1 today for replacement. With battery # 1 unhooked/removed, I found that my house electronics still worked no matter what position the house selector switch was in, with the exception of "off"

--Shore power was unhooked..

Anyone have any similar findings on their boats?
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Old 09-01-2015, 01:52 PM   #2
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It depends on how the Starting side is wired. I suspect it is to a single pole (either Batt#1 or Batt#2) and is acting as a simple ON/OFF isolator. You can run pole #2 on the house bank to Pole #2 on the Starter. This way when both are at #2 you're actually starting the engine with the house bank.

House Switch: Batt #1 to the Batt #1 position. Batt #2 to the Batt #2 position.

Start: Batt#1 to the Batt# pos.

remove the switch and look at the back of the switch to see which positive leads are connected to which poles.
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Old 09-02-2015, 02:41 AM   #3
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Thank you for the reply.. I didnt have a chance to take it apart yet but I did do some further testing.. The battery selector switch for the engines (1 switch controls both engines) does work properly.. Battery #1 disconnected, and switch to #1, I get no beep/tone or engine start.. Switch to #2 and I get tone/start..

So the engine switch is wired correctly, just the house switch is not. Ill explore further..
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Old 05-01-2016, 09:46 PM   #4
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Any one else experiencing this. The wires are really hard to trace back.. The boat came with two 27 size batteries run in parallel as battery #2, and one 24 size as battery #1.. Which is considered or should I be using as my starter battery?
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Old 05-01-2016, 10:11 PM   #5
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The single battery is the starting battery while the two in parallel are house power.
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Old 05-01-2016, 10:31 PM   #6
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Thank you for the response.. Thats what I have thought, but I have also been told the opposite. I would think that the two 27s run in parallel would be for the extra amperage for house stuff.
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Old 05-02-2016, 03:19 AM   #7
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Quote:
Originally Posted by cjc357 View Post
Thank you for the response.. Thats what I have thought, but I have also been told the opposite. I would think that the two 27s run in parallel would be for the extra amperage for house stuff.

Exactly
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Old 04-04-2017, 12:48 AM   #8
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I think I have the same problem, and am extremely frustrated when anchored and the house kills all the batteries and I'm be dead in the water. I can't even start the generator (do you have one)? How did you end up wiring to fix the problem?
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Old 04-04-2017, 02:41 AM   #9
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Quote:
Originally Posted by Oscar Tango View Post
I think I have the same problem, and am extremely frustrated when anchored and the house kills all the batteries and I'm be dead in the water. I can't even start the generator (do you have one)? How did you end up wiring to fix the problem?
When at anchor have you tried switching the starting battery off to prevent it from being run down? If this works a isolator should help. Are your house batteries in a separate switch and if so what position is it in?
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Old 04-04-2017, 01:16 PM   #10
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Hi guys, no I never really looked into this further. To recap, my boat has two battery selector switches and three batteries. Two 27 size run in parallel and one single 24.

The two selector switches, one is for starting/engines, and you can select the 24, or the (2) 27's or both.. Then I have a "house" switch which offers the same selections.

Problem I have is no matter what you change the "house" switch to, all batteries are being used. I have tested this by removing the (2) 27 batteries and setting the house switch to any setting (but off) and I still have house power..

I was told it could be a bad switch, but never really investigated further. Any thoughts.
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