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Old 10-04-2014, 09:55 AM   #1
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Blue Sea Systems Disconnect Switch Installation

I just purchased a Blue Sea Systems battery disconnect switch to install on my camper with two 12 volt batteries. The switch has three posts labeled "1" "2" and "common". I am assuming the positive wire from each battery goes to terminals 1 and 2 but common has me confused; is this the location for ground wire from the camper frame position?
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Old 10-04-2014, 10:13 AM   #2
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No!!!..its the positive output of the switch....DO NOT GROUND IT
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Old 10-04-2014, 10:14 AM   #3
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The common goes to the camper wiring....it is a positive output selected by the switch. (1,2, 1+2, or off)
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Old 10-04-2014, 10:17 AM   #4
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MMMMmmm so now I'm really confused. Good Ole Websters dictionary says the term "Common" means ground or neutral, so if the ground doesn't go there what does? Am I correct in assuming the positive wire of each battery goes to terminal labeled 1 and 2 on the switch? Can you be more specific on how this is wired?
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Old 10-04-2014, 10:18 AM   #5
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That could have been BAD!!!!!!
: blowup:
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Old 10-04-2014, 10:22 AM   #6
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Okay we've established that I'm pretty dumb when it comes to wiring and electricity. So anyone know how to wire this switch that can give me directions in VERY simple terms before I create a mushroom cloud over PA?
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Old 10-04-2014, 10:37 AM   #7
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POS + wires from batteries go to the 1 and 2 on the switch and the common is the wire that goes back to the camper. when you remove the pos wires from the batteries where they connect to the camper you would have to remove them from that terminal and move those to the new switch. then from the common from the switch you need a wire from the common on the switch back to that terminal.
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Old 10-04-2014, 10:47 AM   #8
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I'm feeling really dense right now. When you say common wire is the wire that goes back to the camper are you saying that a wire goes from the post labeled common on the switch to each positive terminal on the battery; so there are two wires going back to the batteries (one to each positive post)? So bottom line it would be battery 1 + goes to switch post 1, battery 2 + goes to switch post 2 and then a separate wire from each battery + post back to the switch common post?
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Old 10-04-2014, 10:49 AM   #9
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Just take the wire from the camper that was on the + positive terminal and stick it on that "common"...never mind the name....then the positives from each battery to 1 and 2....

There will be only 3 wires coming from the switch. .1 from the positive on each batt to post 1 and 2...then think of the "common" as an output....where the switch selects which source is the output...bat 1, bat2, both, or neither....
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Old 10-04-2014, 11:02 AM   #10
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Okay, I think I got it. This would mean I need to purchase another wire because once I remove the camper wire from the positive side of one battery, and put it on the common side of the switch, that battery will no longer have a wire on the positive terminal. Sorry to be such a pain in the rear, but I really don't understand electrical connections at all. Thanks for the help - Let me know if you smell smoke!
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