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Old 01-07-2014, 08:31   #1
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Battery Disconnect To Replace 1-2-Both

I have read that the usual 1-2-Both selector switches can fail from weak contact pressure due to the design, and that simple disconnect switches are more reliable.

50 Amp Battery Master Switch - Accessories, Battery Switches - Hella Marine

So my 1-2-Both switch has failed after 14 years. Another switch lasting 14 years should take care of me , but my sons may well want to keep the boat in the family .
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Old 01-07-2014, 08:40   #2
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Re: Battery Disconnect To Replace 1-2-Both

Sorry for the premature posting!

So I thought I'd look into separate positive contact disconnects for each battery.

The question is, has anyone used this type switch and which did you install? The Hella switch is rated for 50 amps which I think is insufficient. I found one on the O'Reilly autoparts site made by BWD rated at 175 amps continuous, but wonder if it really is any better.
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Old 01-07-2014, 08:44   #3
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Re: Battery Disconnect To Replace 1-2-Both

What size wire does your switch have? The switch and wire rating should match, and more important overcurrent protect should be sized for the smallest rated item.

But I would just replace with switch with the same type it had. If you start over doing stuff it never ends.
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Old 01-07-2014, 08:47   #4
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Re: Battery Disconnect To Replace 1-2-Both

Blue Sea has some nice, expensive remote switches.
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Old 01-07-2014, 09:03   #5
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Re: Battery Disconnect To Replace 1-2-Both

The cable is spec'd to be 70 (mm squared I believe).

And I know, replacing with the same would be the easy solution.

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Originally Posted by sailorboy1 View Post
What size wire does your switch have? The switch and wire rating should match, and more important overcurrent protect should be sized for the smallest rated item.

But I would just replace with switch with the same type it had. If you start over doing stuff it never ends.
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Old 01-07-2014, 09:04   #6
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Re: Battery Disconnect To Replace 1-2-Both

I've looked at some Blue Sea switches, but not remote!

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Blue Sea has some nice, expensive remote switches.
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Old 01-07-2014, 18:43   #7
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Re: Battery Disconnect To Replace 1-2-Both

70mm square wire is close to 2/0 so a 50 amp switch capability is very insufficient. Blue Seas manual battery switches - even the smaller ones like the 6006 or 6007 are rated at 300 amps continuous and very reliable.
m-Series Mini On-Off Battery Switch with Knob - Red - Blue Sea Systems
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Old 01-07-2014, 21:00   #8
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Re: Battery Disconnect To Replace 1-2-Both

Thanks. I'm looking at that one.
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Old 02-07-2014, 11:32   #9
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Re: Battery Disconnect To Replace 1-2-Both

Cole Hersee makes some decent battery disconnects as well plus they rate them as marine. The higher amp ones are not all that cheap thou.
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Old 02-07-2014, 11:41   #10
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Re: Battery Disconnect To Replace 1-2-Both

Actually, that's what I had, and what has failed.

But since I'm trying to resolve battery issues--maybe caused or exacerbated by the defective switch??-- I'm going back with the same.

Perhaps I'll do something different in the future, when I have more time.

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Cole Hersee makes some decent battery disconnects as well plus they rate them as marine. The higher amp ones are not all that cheap thou.
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Old 02-07-2014, 11:46   #11
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Re: Battery Disconnect To Replace 1-2-Both

Yeah they have battery switches but they also have switch type disconnects
Battery-Related Products | Battery Selector/Master Disconnect Switches75920-05 | Cole Hersee - Littelfuse
Battery-Related Products | Master Disconnect Switches | Cole Hersee - Littelfuse
Or you could go all European with some Albrights
Curtis/Albright and Albright Battery and Emergency Disconnect Switches
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Old 03-07-2014, 08:59   #12
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Re: Battery Disconnect To Replace 1-2-Both

Those are some nice looking switches.

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Old 04-07-2014, 10:00   #13
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Re: Battery Disconnect To Replace 1-2-Both

I suspect you may be referring to the old Cole Hersee 705, or similar one. These are now discontinued, but are available new at deeply discounted prices, viz...

Cole Hersee Battery Switch (Old M705) COL-M750, Electrical

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Old 04-07-2014, 20:52   #14
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Re: Battery Disconnect To Replace 1-2-Both

We sell both Cole Hersee and Bep in Victoria at Trotac Marine. But 100% of the battery switches we sell are Blue Seas. Haven't had one issue in the hundreds sold nor the ones I have installed.
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