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Old 09-13-2015, 09:35 PM   #1
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Knife disconnect switch

I am planning on installing a knife disconnect on my 12 volt battery. Should i place it on the positive or negative?
Thanks for your help.
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Old 09-14-2015, 10:05 AM   #2
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Don't do a knife. There are so many better (safer) disconects out there, that you really don't need a knife switch, unless you want to feel like Dr. Frankenstein whenever you throw it.

It makes not a whit of difference which side of the battery is disconnected, but for some reason, people generally tend to do the positive.

Tim
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Old 09-14-2015, 10:42 AM   #3
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I agree with everything Cowracer said. It's standard practice to break the positive side here in the US.
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Old 09-14-2015, 11:43 AM   #4
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Quote:
Originally Posted by Bama Rambler View Post
I agree with everything Cowracer said. It's standard practice to break the positive side here in the US.
Yes it is the standard practice, even if it doesn't make as much sense as breaking the ground circuit. However, every auto mechanic knows to disconnect the battery ground strap before removing engines or trannies. That, too, is standard practice.
I'd break the circuit with the single wire. Some trailers have two or three wires attached to the positive post. On those it makes more sense to switch the ground circuit (single wire).

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Old 09-14-2015, 12:21 PM   #5
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Break the positive. If you break the ground and forget to turn It on, you lose the trailer breakaway. Also, if equipped, you will still have use of your power jack. I recommend a marine type switch.

http://campinglifewithmatt.blogspot....ct-switch.html
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Old 09-14-2015, 02:36 PM   #6
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Break the positive. If you break the ground and forget to turn It on, you lose the trailer breakaway.
As they say, "'nuff said."
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Old 09-14-2015, 04:01 PM   #7
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This is what I use I disconnect the ground first ATTACH]88662[/ATTACH]Click image for larger version

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