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Old 02-17-2016, 08:52 AM   #11
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Originally Posted by havnfun View Post
Got a single on/off disconnect at CW yesterday. This one says to hook up on the negative line. The double one said the positive line. Why the difference?

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If you ask 10 people as to which terminal the disconnect switch should be on you will probably get 60% saying the POSITIVE terminal, if you ask 10 people why, most likely most will not have a good reason. The jury is still out on this one, but there are some logical reasons as to why to disconnect the NEGATIVE. The main one is that with the NEGATIVE connection opened there is no chance that you could accidently short out something while working on your electrical projects around the batteries (with no shore power connection). There are also a some studies that show by disconnecting/connecting the NEGATIVE terminal produces less of an arc (should there be a large load on the battery at the time). Go figure… I believe NASCAR still requires that the POSITIVE side of the battery be disconnected, unless they changed that old rule.

NEGATIVE side is the one you want


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Old 02-17-2016, 09:54 AM   #12
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Like Mustang said.

But I'm one of the other 10 people. (And so is my Northpoint designer..and my Progressive Dynamics power center designer) My disconnect is on the positive for various reasons.

It's simple to cut power at the negative. Probably the route you want to take.

If your putting the disconnect in a compartment, your ground wire probably won't be long enough to connect to the switch and still reach the frame ground point it was on. So you'll need a new longer ground wire, and another wire from the battery.
Depends how your doing it.

If you disconnect the +12v, most likely your old wire will reach and you'll need a new wire from the battery to the switch. Again, depends on how you are doing this.
But the wire before the switch is still "live". So like I said before, if you choose to disconnect with the positive, put an inline fuse or breaker around 6 inches after the battery.

Six of one, half dozen of the other.

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Old 02-17-2016, 05:24 PM   #13
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Klassic and Mustang65-

Guess I'll go with the negative side as suggested. Why do things have to be so complicated. I'm a finance guy and I want things black or white but I am finding a lot of grey areas in the world of RVing. That's okay I guess...it sure makes things interesting.
Thanks for your help and comments.

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Old 02-17-2016, 06:23 PM   #14
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Black is positive, white is negative. LOL

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