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Old 10-31-2015, 12:23 PM   #1
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Question How to Disconnect House Batteries

You would think I would remember after all these years, but I forgot! What is the sequence used to disconnect the house batteries? I can't remember if you disconnect the negative sides first, or the positive sides first. I will be storing them in my garage and using a Battery Minder on them for the winter.

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Old 10-31-2015, 12:47 PM   #2
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Negative side first.


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Old 10-31-2015, 12:49 PM   #3
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Originally Posted by Hutch333id View Post
Negative side first.
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Old 10-31-2015, 01:02 PM   #4
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From an electrical point of view, it doesn't matter.

From a safety point of view, some say to remove the negative first since the negative side is grounded to the chassis. This avoids, while removing the positive lead, your metal wrench contacting a portion of metal (not the other battery post) that is grounded to the negative post, creating a major sparks shower.

I personally don't worry about the order too much from having worked on live circuits (usually more than 12V). I just make sure the end of my wrench and my hand do not touch other metal (including the other live terminal, which is usually the easiest thing to touch inadvertently) while removing wires.

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Old 10-31-2015, 01:14 PM   #5
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" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350">

The 12volt Side of Life (Part 1)

Negative connector first and last.
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Old 11-01-2015, 11:56 AM   #6
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Originally Posted by Hutch333id View Post
Negative side first.

Sometimes you wind up working on a hot circuit. For example, you might wire in a charger and not be bothered (perhaps foolishly) to disconnect all of the grounds from the batteries.

So, I just take the added precaution of wearing gloves to insulate my hand, particularly my ring fingers, in case I make a mistake.
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Old 11-01-2015, 01:16 PM   #7
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If you leave the house cables loose and there's any chance you will start your Georgetown, tape up the positive cable terminals. When you run the chassis engine the battery control center will energize the relay that connects the chassis battery and the coach batteries. If one of the positive cable terminals touches metal it will be grounded and you will at least get a spark. Damage could result.

The same thing could happen if you plug in to shore power. The convertor will send 12 volts to the coach battery cables.
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Old 11-01-2015, 04:57 PM   #8
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I never use a wrench to remove battery cables. I use a socket and a composite socket driver from HFT. No chance of shorting anything out.

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Old 11-01-2015, 05:25 PM   #9
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Put a disconnect switch in line. That way you don't have to deal with removing battery cables.
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Old 11-01-2015, 05:38 PM   #10
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I also always try to use a wrench that is shorter than the distance between the battery terminals.

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