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Old 06-08-2016, 11:49 AM   #1
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Battery cut off switch

Could someone tell me why you would put a cut off switch on your camper's battery? How do you do it.
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Old 06-08-2016, 11:51 AM   #2
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If you don't put in a battery disconnect when not in use and not plugged into shore power the battery will go dead from phantom draws.



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Old 06-08-2016, 11:53 AM   #3
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Could someone tell me why you would put a cut off switch on your camper's battery? How do you do it.
I just put mine on last night because over the course of the campers first year, the constant draw from the CO2 detector and radio seems to have killed the battery to the point my awning won't retract without the motor cycling. Replaced the battery, awing comes in fine.

I mounted the switch to the side of my battery box. You will also need to purchase a short battery lead to get from the battery to the switch, then the camper lead hooks up to the other side of the switch.

This is what I used. The knob is removable as https://www.amazon.com/Marinco-701-B...=1&*entries*=0
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Old 06-08-2016, 11:54 AM   #4
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The camper has items that constantly draw power from the batteries. Most single battery campers will go dead in about 3 days and once a battery is fully discharged, it will have permanent damage which is evidenced by reduced capacity.

Having a battery selector switch is an easy way to disconnect the battery without pulling the lug terminal off of the battery each time you want to connect or disconnect.

How to do it:
Buy cable, cut to size for location of switch, crimp or solder connector to battery cable, attach to switch and your are done. Run wire from + terminal to switch.

My fifth wheel has 3 battery banks and each one is switched.

Recommend you use a Blue Sea Systems switch which are easy to rotate and well made. Perko are good switches but wife has trouble rotating them.

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Old 06-08-2016, 12:10 PM   #5
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Run wire from + terminal to switch.
I have read that some people put it on the - terminal and some put it on the + terminal. Which one should it be put on?
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Old 06-08-2016, 12:18 PM   #6
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Which terminal

By all means the + (positive) terminal.
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Old 06-08-2016, 12:43 PM   #7
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I always just put a on/off switch on the negative cable. Easy and you don't have to buy extra cable.
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Old 06-08-2016, 12:47 PM   #8
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I have read that some people put it on the - terminal and some put it on the + terminal. Which one should it be put on?
I put mine on the negative terminal. It shuts off everything including my power jack. I can't hook up without the switch being on. To me it's much safer that way. No chance of forgetting to turn it on before pulling out.
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Old 06-08-2016, 01:13 PM   #9
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Installing battery cut off switch.

This is from a previous post of mine. See attached. Would not be without one.
Attached Files
File Type: pdf Installing Battery Disconnect Switch.pdf (1.34 MB, 219 views)
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Old 06-08-2016, 01:31 PM   #10
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My trailer came with a power disconnect switch on the positive terminal that serves me well. It doesn’t disconnect my slide out motors, landing gear nor rear stabilizer but it does turn off all my parasitic draws. If I were to add a battery cutoff switch, I would put it on the negative side of the battery for the same reasons you should disconnect the negative battery post first when removing a battery.


A wrench or tool accidently touching the negative terminal to ground on an installed battery has no effect. After first disconnecting the negative terminal of the battery, shorting the positive terminal to grounded trailer parts with your wrench also has no effect either because the negative terminal is open. On the other hand, accidentally shorting the tool to ground, while disconnecting the positive battery terminal first, can cause a large spark.


This may not be a major concern but it is the reason many advocate putting the battery disconnect switch on the negative terminal instead of the positive one. In either case, the battery is electrically disconnected from the trailer.

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