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Old 09-06-2014, 11:53 AM   #15
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Quote:
Originally Posted by nothermark View Post

In a nutshell, how many times have you read "check for a bad ground" or "it sounds like a bad ground"? When you put a switch in the ground lead you make a bad ground for the whole system.

From a technical side introducing any resistance in the common return leads to developing a signal across that resistance. IF all one is doing is lighting a lamp it usually does not have noticeable effect. Once one adds complicated electronics signals start mixing together in the ground return and small unwanted couplings happen that lead to RF noise, Amplifier hum, and crosstalk in all signals. As the switch contacts oxidize and loosen over time the problems get worse until they become an obvious problem.

FWIW the common can be either the negative or positive side. The point is that in the US it is usually the negative rail. Most of the electronics sold here are built around that concept.
I would put it on the positive post because some things get their grounds through the frame other than the negative post therefore could drain battery anyway.
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Old 09-06-2014, 12:11 PM   #16
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Old 09-06-2014, 02:09 PM   #17
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Old 09-07-2014, 01:19 PM   #18
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Great video!


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Old 09-07-2014, 03:53 PM   #19
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It it's on the internet it must be true...

FWIW most of what he is saying will have the same results with a negative disconnect and a powered device. However current can flow it will. I just wonder where he got the wrong disconnects. Probably from European Positive Ground systems. ;-)
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Old 09-11-2014, 07:21 AM   #20
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I think the only argument for not connecting to the "neg" side would be in respect to corrosion. Having said that, many of the Battery Disconnect Switches on the market are designed to be used on the "Neg" side. The more connecting points in a "Neg" circuit, the greater chance of a circuit failure.
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Old 09-12-2014, 05:56 AM   #21
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Originally Posted by ksmith View Post
I would put it on the positive post because some things get their grounds through the frame other than the negative post therefore could drain battery anyway.



Buy a good quality (marine grade for example) rotary disconnect swith and place it on the positive. In fact you could probably go to your local Marina tell them what you want and they will make the appropriate sized cable you need to hook it up.
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Old 09-12-2014, 08:20 AM   #22
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I would put it on the positive post because some things get their grounds through the frame other than the negative post therefore could drain battery anyway.
ksmith
Me thinks you don't understand how 12VDC systems in vehicles work.
If EITHER the positive OR the negative wires/cables are "disconnected" from a battery, (or a "bank" of batteries), NO 12 volt power can flow out of, (or into), the "disconnected" battery/batteries.
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Old 09-13-2014, 12:08 PM   #23
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I have my T/T plugged in at home but worry about "cooking the battery" If I put a disconnect switch on the battery to stop it from being overcharged will the rest of the T/T still have power?
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Old 09-13-2014, 12:42 PM   #24
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I have my T/T plugged in at home but worry about "cooking the battery" If I put a disconnect switch on the battery to stop it from being overcharged will the rest of the T/T still have power?
Thanks
Mike
Yes, as long as it's plugged into shore power, everything else will be powered up.

I've had two different 5th wheels that boiled the batteries dry while in storage (plugged up) and knowing that they will discharge themselves over time if not plugged in because of the LP sensor, if nothing else, I've installed disconnects on my last two(on the negative terminals) and never had any problems since. I still check the batteries on a monthly basis and top off with a good digital charger that I carry in the camper.

I don't really trust the built in battery charger function anymore and I get a better warm and fuzzy feeling with things since I've gone that route.

It's not a good feeling when you're loading up to head out and find out that you've got to spend some big bucks to replace batteries before you leave.
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Old 09-13-2014, 12:57 PM   #25
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Thanks kg.
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Old 09-13-2014, 02:32 PM   #26
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With AC the switch has to be on the hot side or very bad things will happen.
On DC either the pos or neg can be switched, it is only for a safety reason
you see the neg being switched on some battery installs.
It is a normal practice to switch either AC or DC on the hot side as one finds in
almost all items that use either AC or DC.
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Old 09-14-2014, 10:25 AM   #27
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Battery disconnects should be OE on RV's and boats. Parasitic drain kills batteries.
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Old 09-14-2014, 10:56 AM   #28
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Quote:
Originally Posted by timetogo View Post
Battery disconnects should be OE on RV's and boats. Parasitic drain kills batteries.
timetogo
I agree that battery disconnects "should be" OE, (Original Equipment), on all RVs.....(but they certainly are NOT)!
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