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Old 09-19-2011, 11:30 PM   #21
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Originally Posted by Iggy View Post
Switch the Positive side. The reason why is if you jus switch the negitive you can still make a direct short inside the trailer from a positive line to the frame which is ground.

If you switch the positive at the battery you will never have the posibility of a short inside your trailer.

My 2 cents
If the negative is disconnected at the battery, as per a switch, and it is off, then you cannot ground (short) anything anywhere. It is the same as taking the negative cable right off the battery.

I am a negative kind of guy.
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Old 10-29-2011, 08:45 PM   #22
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<<If you switch the positive at the battery you will never have the posibility of a short inside your trailer.>>

Doesn't make any difference. Once the battery is disconnected in any manner, at one of the posts, it is out of the circuit.

Here is why you disconnect the negative cable first when you change a battery:

If you put a wrench on the positive cable, and in the process of unscrewing the bolt touch the wrench to the frame, then you have a direct short of the battery to the frame, with a pretty decent conductor. If you loosen the negative side, you can jump it to anything except the positive cable and it will not bother anything. Once you have the negative disconnected, then you can work on the positive and not worry about shorting it to anything (so long as you don't have an inverter trying to make 12V for you.

Once the switch is in place, it doesn't matter which side you open. If I were to put in a switch, I would probably put it on the positive side, but do the work while the negative cable was disconnected. One of the advantages of having the switch on the positive side is that it gives you a stud connection to connect a battery charger or other accessories. But you need to make sure to protect these connections from accidental shorts.
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Old 10-29-2011, 09:28 PM   #23
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Why do builders place a fuse on the positive wire closest to the power source?

The answer will tell you why you need to switch the Positive wire and not the Negitive.
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Trouble is, we're dealing with a 12V DC system, NOT a 110V AC system.
Answer me this; why are switches in automotive electircal systems placed on the ground side of the circuit?
Though in reality, it doesn't make a difference which side you connect the switch, I have always placed it on the ground side in automotive applications.
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Old 10-30-2011, 07:08 AM   #24
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ok , silly question but why not save the time and money and just disconnect the battery
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Old 10-30-2011, 07:20 AM   #25
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ok , silly question but why not save the time and money and just disconnect the battery
If you go camping a couple times a year this is a fine plan.
We go 6- 10 times a year. I want my battery connections to be tight
and I coat them with a compound that keeps corrosion to a minimum so
they are very messy. AND it's a pain in the neck to have to loosen
the tie down strap and take the battery box top off each time.

A switch is just SO much easier.
My 2˘

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Old 10-30-2011, 07:56 AM   #26
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When I add an on/off to my battery box, which side (positive or negative) should I install the switch?

It seems like a silly question to me, but I've seen significant debate in another forum without any real conclusion.
Now you have seen significant debate on this forum! What is the conclusion?? Youroo!!
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Old 10-30-2011, 10:45 AM   #27
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did not really see a time he was disconnecting the battery , thought it was more of just a winter storage thing , so next question is why put in a disconnect at all , had one on my last camper and it went bad , had alittle power going through but not very much , lights very dim , thought it was a bad battery and had it checked , found out it was good , checked things more and found out disconnect went bad so just bypassed it , leave my batterys in year round , pluged in or on a tender
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Old 10-30-2011, 08:07 PM   #28
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<<Answer me this; why are switches in automotive electircal systems placed on the ground side of the circuit?>>

When you get into electronically controlled devices things are a bit different. It is easier to pull a wire to ground with an electronic driver. But when you are working with mechanical switches, those were typically switching on the positive side. A few of the circuits (like a dome lamp) would have the ground connected through a door switch (or multiple door switches) that were a direct connection to the frame. Or idiot light type sensors- The lamp would have 12V to it and the switch would connect the other side to ground when the light should be on.

Either side works.
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Old 10-31-2011, 08:02 AM   #29
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Now you have seen significant debate on this forum! What is the conclusion?? Youroo!!
I installed it on the positive side. That said, I've enjoyed the discussion.
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Old 10-31-2011, 08:21 AM   #30
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I see this one used often as well, mounted right on the top, or side, of the battery box...

Amazon.com: Pico 5575pt Master Batt Isolator Switch: Automotive
That's the switch I had on my other TT and it lasted just over a year. Seems the inside wore out. Sometimes i would turn it on and it wouldn't make good contact inside. I would have to jiggle the key to make it connect. This is what I did on my new TT and the switch seems to be very well built. I took a thin piece of metal and modified it to where I could fasten it under the tongue jack, then I secured the switch to that.
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