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Old 01-23-2012, 06:50 PM   #41
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Originally Posted by Walke View Post
Always switch the positive side,(unless you are in Europe) the direction of the current doesn't matter to a contact switch. I don't believe a sound technical reason can be made for switching the negative (ground) side of a battery.
On the disconects for our race cars I always put the on off switch on the ground period, that way it kills the system Dead, Nascar agreed with me and now recommends it in all 3 top divisions
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Old 01-23-2012, 07:23 PM   #42
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Like I said, there are no technical reasons to put it on the ground side just opinons !!
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Old 01-24-2012, 08:59 AM   #43
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Like I said, there are no technical reasons to put it on the ground side just opinons !!
As a retired electrical engineer - who never designed RV electrical
systems - it certainly seems that there is no difference between
opening the "hot" or ground lead.....If, and only if, the switch is
very close to the battery posts.........

If the switch is in the hot lead and is quite a distance from the
battery, you will have a long lead and one (switch) terminal that is
ALWAYS live. This opens the possibility of a "short" to ground.
The ground lead is usually quite short - connecting to the nearest
chassis point - so a switch in the ground lead would likely not
have this situation.

I would call that a "technical" reason...........YMMV.

cheers,
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Old 01-24-2012, 10:36 AM   #44
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I would call that a "technical" reason
John,

It has been my experience that no amount of "reasoning" (technical or otherwise) will convince some folks to change their mind. Tightly held opinions (or beliefs) do not yield well to facts or tolerance of another's view of reality.

Caveat Lector and press on
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Old 01-24-2012, 10:46 AM   #45
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John,

It has been my experience that no amount of "reasoning" (technical or otherwise) will convince some folks to change their mind. Tightly held opinions (or beliefs) do not yield well to facts or tolerance of another's view of reality.

Caveat Lector and press on
Doggone it, I forgot all about that.

Well maybe my wife's right when she says that "when I
retired, I left my brain lying on my desk at the office".........

D'oh!

Be happy,
johnd
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Old 01-24-2012, 12:41 PM   #46
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Originally Posted by Walke View Post
Always switch the positive side,(unless you are in Europe) the direction of the current doesn't matter to a contact switch. I don't believe a sound technical reason can be made for switching the negative (ground) side of a battery.
I thought I was a positive person until I started reading this thread then negativity started creeping up on me and now I don't know what I am

"unless you are in Europe" Hey I am in Europe I'm positive about that, so I must be negative, right, not sure why Europeans must all be negative tho when most of Europe is positively bankrupt? This is so confusing

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Old 01-24-2012, 01:09 PM   #47
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Don't feel bad Nigel; Ken's post confused me, too.
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Old 01-24-2012, 04:25 PM   #48
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I believe it goes back to disconnecting and connecting battery cables on a car. If you take the positive off first or connect positive last you can get a spark which can ignite the gasses from battery. By doing it opposite you get no spark. Holds true with jumper cables. Positive first then Neg. but not to battery but to another ground
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Old 01-24-2012, 04:48 PM   #49
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Originally Posted by jim44646 View Post
I believe it goes back to disconnecting and connecting battery cables on a car. If you take the positive off first or connect positive last you can get a spark which can ignite the gasses from battery. By doing it opposite you get no spark. Holds true with jumper cables. Positive first then Neg. but not to battery but to another ground
While the spark business above may be true, the "making and breaking" is limited to the interior of the switch. That "spark" at the contacts will occur regardless of where the switch is located.
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Old 01-24-2012, 05:17 PM   #50
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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 you put the switch in the ground lead and OPEN it, the chassis
is *NOT* ground!!! It is "floating" - just a plain old hunk of metal
with no connection to the battery - and you don't have a completed
circuit. No current flow; no sparks.........

Now if you are connected to a tow vehicle and the electrical systems
of the two are interconnected (including chassis connection), that's
a whole 'nother Barrel of Snakes!
Also the same in the case of a MH, rather than a TT where you
have multiple batteries to consider. But that's not what we were
talking about............


cheers,
johnd
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