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Old 01-23-2015, 07:48 PM   #11
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Originally Posted by SeaHarley View Post
I understand what you are saying. As I thought the same thing.

My guess is that maybe there is some sort of ground going on through the convertor as that is connected to the same buss inside.

I'm only stating the way it is working on my trailer, I suggest you check your own.

What was happening on mine, and the way I found this out was; my propane detector started going off continuously, the red light was on instead of green. And my radio memory (blue background) light remained on. And my battery voltage was still dropping over a few days. So I put the meter across the pos. and neg. terminals inside on the panel and found what I'm calling stray voltages between 3 and 6 volts..... Go figure.

So yesterday, I finally got a chance to switch it over from the negative to the positive side. The switch is located right at the battery as I did a post on it.

Battery Cut Off / Disconnect Switch

Anyway, now, with the switch "off", there is no voltage inside and the propane detector light and radio lights are off....
Strange....? With my negative side of the battery running through the switch when I have the batteries disconnected I have no power to anything including all detectors and the radio. The whole trailer is powerless...This was the same with two previous trailer I have owned. I'm not sure where or how you got power or current to those things without battery being fully connected. Something seems off in your setup? Do you have two batteries or one? If two did you use the negative cable that was running to the frame?
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Old 01-23-2015, 08:07 PM   #12
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I only have one battery, and one ground wire from the battery. (Although I will be adding a 2nd battery in the future.)

Like I said, I'm only stating what happened on and with my trailer. I am not an electric buff, etc. And I am not saying I am right or anybody else is wrong.....

My trailer is a 2012 and really only 2 years old.

My reason for posting this, is to point out that not all trailers are the same.

I would suggest for anyone reading this and thinking about doing it, before you do, first disconnect the ground wire from your battery and make sure that all lights, etc. are off and there is no voltage inside at the panel. If not, then you are good to go.
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Old 01-23-2015, 10:18 PM   #13
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There must be an issue with your battery, switch or something else...
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Old 02-01-2015, 09:20 AM   #14
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I'm no electrician, but would the battery still provide a current if the neg side of the battery was off at the battery, but the item in the RV was direct grounded to the frame of the RV. Would that not complete a circuit?
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Old 02-01-2015, 01:43 PM   #15
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I'm no electrician, but would the battery still provide a current if the neg side of the battery was off at the battery, but the item in the RV was direct grounded to the frame of the RV. Would that not complete a circuit?

Every 12V item in an RV is direct grounded to the frame at some point, except maybe the tongue jack on a TT and the breakaway switch on a TT. (which was how mine was wired)
ONLY if the negative from the battery was still somehow connected to the frame could there be voltage beyond the two post on top of the battery.
My vote is a switch issue that is now not showing itself while connected to the positive side. (or not showing up as readily)
High voltage AC and super high voltage DC will make an air gap if close enough, 12 VDC will not.
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Old 02-01-2015, 01:57 PM   #16
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It is possible to pick up a high impedance ground potential thru a plastic battery box. Either thru static electricity or condensation. This was an issue with my boat a few years back. Had a disconnect on the negative side and had to move it to the positive terminal. Just my input.
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Old 02-01-2015, 02:05 PM   #17
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Thanks for the info.


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Old 03-09-2015, 11:48 AM   #18
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Great write up, I was just in the process of doing this, thanks...Sherm
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Old 03-12-2015, 10:56 AM   #19
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For you Canucks, Princess Auto has the switch you see in the pics, $15.00. It also has a removable knob so no one can dick with the switch, not that I know anyone that would want to dick with my switch???????? This switch has a bottom plate that worked nicely by putting it on the inside of the battery cover to give the entire assembly a little more stability. I also bought two short lengths of battery cable and added them on, this way it makes taking the cover off and disconnecting the battery very easy. I did hook it up to the positive side, as per the instructions that came with it. Sherm
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Old 03-12-2015, 10:59 AM   #20
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Nice job Sherm!
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