Battery Cut-Off Switch Wiring Diagram?

[pjnewlin]

Hello,
I bought a battery cut-off switch to attach to the side of my battery box to allow me to disconnect the battery when not in use. I have not been able to find a video or a diagram of how to run the cables/wires. I have watched YouTube videos, but they all show how to attach the switch and then show a brief shot of it wired, but not long enough for me to figure it out.
I have a single battery and need to know how to adjust the cables once the switch is attached to the battery box?
Any help would be greatly appreciated. Thanks

[GHen]

Take your negative cable from the battery to the switch, then you need to buy/make a new cable to run from switch back to the battery.

That will give you a complete battery disconnect.

[pjnewlin]

Thanks. Does the cable going back from the switch to the battery connect with the other cable on the switch or on the other screw? Also , where does the cable running back to the battery connect at?

[NorCal Eagle]

Usually, I see battery disconnect switches wired in on the positive side of the battery. Here is a simple wiring diagram I found on Google.

[GHen]

Using the positive works well. I guess it’s better to use the negative when you are just unhooking the cable, I think it sparks less.

[Xboaters]

What Eagle said! ��

[pjnewlin]

Thanks. Hopefully I will get it figured out.

[madmaxmutt]

Originally Posted by NorCal Eagle

Usually, I see battery disconnect switches wired in on the positive side of the battery. Here is a simple wiring diagram I found on Google.

Attachment 49002

That image is for a powered vehicle, not a trailer. Note the starter/fuel pump connections. Even on vehicles this is debated. NHRA requires disconnects on the positive side, but NASCAR requires it on the negative side. This is for killing the engine along with all power.

Negative switches are much easier and safer IMO. A positive switch adds terminals to short out to ground. Disconnect a negative with a swtich and touching a tool to the battery is safe. Disconnect the positive and touch that tool to metal and the positive terminal and see what happens.

[kiwaon]

Don't know what type of trailer you have but if it has electric brakes you might want to bypass the switch for the brakes, thus it would require the switch to be on the positive side. Reason being if the trailer breaks away from the tow vehicle you want the trailer battery to apply brakes to the trailer.

[pjnewlin]

Do you have a diagram?

[BabyBear]

Is pulling the fuse just as sufficient as installing a switch?
The fuse on my 212QB is easily accessed and i just put it into glove box while in storage.
Should I also install a switch or is it just personal preference?

Cheers

[wags999]

Originally Posted by kiwaon

Don't know what type of trailer you have but if it has electric brakes you might want to bypass the switch for the brakes, thus it would require the switch to be on the positive side. Reason being if the trailer breaks away from the tow vehicle you want the trailer battery to apply brakes to the trailer.

The battery should always be on when towing. You only use the disconnect switch when the RV is in storage.

[Wireman]

Originally Posted by NorCal Eagle

Usually, I see battery disconnect switches wired in on the positive side of the battery. Here is a simple wiring diagram I found on Google.

Attachment 49002

X2 I prefer no power feeding anything inside.