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Complete Dual Battery Disconnect?

Old 08-11-2013, 06:42 AM
  #1  
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Default Complete Dual Battery Disconnect?

My boat lives on a trailer under cover. And the bilge pumps are hardwired for obvious reasons along with float switches so even when the selector switch is off there is potential for battery drain. A few months ago the aft float switch apparently stuck in the on position and drained the number 1 battery completely down. This had happened before so I knew the issue right away. I'll replace the switch but the last time it pretty much killed the battery. The pump is fine.

So what I would like to do is "completely" isolate the batteries via a single on-off switch when the boat is not being used and sitting on the trailer. I've dis-connected the positive terminals right now but what switch would you guys suggest for total isolation?

The easiest way that I've thought of so far would be to install a single battery disconnect and wire it into the negative side of the batteries. But I suspect this would leave potential in some things on the boat that may be grounded by other means.
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Old 08-11-2013, 11:48 AM
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Take a look at something like
Amazon Amazon
or the post terminal equivalent. Very easy to install with no cabling required.
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Old 08-11-2013, 11:53 PM
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easiest thing would be to just move the bilge pump wires to the other side of the swtich. though they are there for a reason. I have seen a boat on a trailer flood with $10,000 of damage from rain....
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Old 08-12-2013, 06:25 AM
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Originally Posted by smac999 View Post
easiest thing would be to just move the bilge pump wires to the other side of the swtich. though they are there for a reason. I have seen a boat on a trailer flood with $10,000 of damage from rain....
It's under a carport with drain plug pulled. If it floods under that thing, we've got bigger troubles than a flooded boat.
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Old 08-12-2013, 06:53 AM
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Move the bilge pump wires (and anything else that might be there) so there is nothing connected to the lead from the batteries but the disconnect switch.
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Old 08-12-2013, 07:03 AM
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do it the "french" way

add a main switch in the negative wire cutting of everything when the boat is on the trailer...
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Old 08-13-2013, 08:53 AM
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There are several ways to handle this depending on your current setup. I'm assuming you are running a 1-2-All battery switch now? You could leave that switch wired in and add a Double pole Battery switch in between the current switch and the battery with a the float switch wired to the out put of the new switch. I would than label the switch to be shut off for land storage only. You could also as mentioned run a cut off switch directly on the battery terminals as done on many classic cars. The other solution would be to swap the float switch fuse with a switchable breaker and a lock out, the breaker could than be turned off when the boat is in storage. The only trouble with all these solutions is they require the operator to remember to keep the switches in the correct position for the use (ie storage or in water)
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