Forgive me, I am confused. I have a TT with two 12V batteries hooked up in parallel. I store my TT at a storage facility and want to help protect my new batteries. I purchased a battery disconnect switch and am confused on how to hook it up. I'll mount the switch to one of the battery boxes and the switch has two posts. Specifically how do I connect it. Do I need another jumper cable from the ground of the second battery to the switch? What goes on the second post on the switch? The trailer ground? Sorry not good at this kind of stuff. Thanks for you help.

Take the switch back, get your money back. Then go buy a 50A fuse holder and fuse. It will go between the battery plus(+) and where the cable goes into the trailer. When you want to store, simply pull the fuse.

If you disconnect either cable from the battery, no current can flow through the system, which is the goal of a cutoff switch. If you have two batteries in parallel, the switch goes from both positive battery posts to the positive cable going to the TT, or from both negative posts to the negative (ground) for the TT. Once installed between the battery(s) and TT, it simply opens the circuit so no electricity can flow. You will most likely need at least one additional cable to make that happen. Hope this was helpful.

Wire it on the negative line between the second battery and the trailer.

1. you will have a + and a - cable between the batteries to parallel them.2. wire the Trailer + to battery 1 +3. wire the Trailer - to one side of the switch4. You need a new wire to connect the other side of the switch to battery 2 -IMO the switch is more convenient than pulling the fuse, also the switch should be on the negative side not positive like the fuse would be.

downtheroad wrote:Wire it on the negative line between the second battery and the trailer.hedge wrote: also the switch should be on the negative side not positive like the fuse would be.Don't do this. It will disable the breakaway brake on the trailer. Connect it to the positive wire. That way the breakaway trailer brake will still be functional even if you forget to turn the battery back on before towing.

Battery disconnect switch - confused | Good Sam Community

beemerphile1
Explorer
Apr 13, 2017
Bobbo wrote:
downtheroad wrote:
Wire it on the negative line between the second battery and the trailer.

hedge wrote:
also the switch should be on the negative side not positive like the fuse would be.

Don't do this. It will disable the breakaway brake on the trailer. Connect it to the positive wire. That way the breakaway trailer brake will still be functional even if you forget to turn the battery back on before towing.

Preach it! I'm with you 100 percent. With a MH, put it wherever you want. With a trailer, it goes in the positive with the breakaway feed connected prior to the switch.
Bobbo
Explorer II
Apr 13, 2017
downtheroad wrote:
Wire it on the negative line between the second battery and the trailer.

hedge wrote:
also the switch should be on the negative side not positive like the fuse would be.

Don't do this. It will disable the breakaway brake on the trailer. Connect it to the positive wire. That way the breakaway trailer brake will still be functional even if you forget to turn the battery back on before towing.
hedge
Explorer
Apr 13, 2017
1. you will have a + and a - cable between the batteries to parallel them.

2. wire the Trailer + to battery 1 +

3. wire the Trailer - to one side of the switch

4. You need a new wire to connect the other side of the switch to battery 2 -

IMO the switch is more convenient than pulling the fuse, also the switch should be on the negative side not positive like the fuse would be.
downtheroad
Explorer
Apr 13, 2017
Wire it on the negative line between the second battery and the trailer.
TurnThePage
Explorer
Apr 13, 2017
If you disconnect either cable from the battery, no current can flow through the system, which is the goal of a cutoff switch. If you have two batteries in parallel, the switch goes from both positive battery posts to the positive cable going to the TT, or from both negative posts to the negative (ground) for the TT. Once installed between the battery(s) and TT, it simply opens the circuit so no electricity can flow. You will most likely need at least one additional cable to make that happen. Hope this was helpful.
donn0128
Explorer II
Apr 13, 2017
Take the switch back, get your money back. Then go buy a 50A fuse holder and fuse. It will go between the battery plus(+) and where the cable goes into the trailer. When you want to store, simply pull the fuse.

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Battery disconnect switch - confused

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