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Old 04-29-2012, 12:11 PM   #71
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Quote:
Originally Posted by 07ultra View Post
the reason you disconnect the neg post first on a car is so if your wrench hits the frame on the pos side it won't spark


I'd also say that if your switch requires a tool to operate, put the switch on the ground.

The cutoff in my trailer is on the positive side.
I have cutoffs in all my cars and trucks that sit. That cutoff is always on the negative side of the battery.

Also, I might recall that the pos and neg terminals on a battery are different sizes. So, when you use that plain old cutoff with the green screw knob, it only fits on the negative terminal. But, I could be mistaken...
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Old 04-29-2012, 07:06 PM   #72
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once in 34 year I had current come in from the negative side and fry all electronic and other items......items are fused on the positive side only most of the time.....so they are protected from high volts/amps on that side but are not protected from the negative side.....

I had to read this several times to get your "drift." I think you meant you hooked up the battery backwards and and cooked a few components, right?

DC current runs in a closed loop. It does not care where the fuse is located. It will blow just fine if it is located anywhere in the circuit as long as it is a high current problem.

Reversed voltage may damage electronics without drawing fuse popping current.
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Old 04-29-2012, 08:39 PM   #73
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Herk, do you have a make and model of your switch? I want get one of these as well. Thanks
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Old 04-29-2012, 08:47 PM   #74
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Marine Battery 4 Way Switch - Blue Seas Systems 9001e

or similar. I went this route because I have two batteries and wanted the option of isolating one if it malfunctioned without rewiring the battery box.

It normally is BOTH or OFF

Amazon.com: Blue Sea Systems 6006 m-Series (Mini) Battery Switch Single Circuit ON/OFF: Sports & Outdoors

If you only have one battery or want to always treat the bank as a unit.
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Old 06-15-2012, 04:55 AM   #75
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For current flow it does not matter. Disconnected is disconnected! But, when you disconnect a battery which side do you disconnect first? The Neg. When you connect a battery which side do you connect last? The Neg. When you "Jump" a battery which side do you connect and disconnec first and last? The Neg. Why? A possible spark could ignite battery gases. At least that's what I was taught.
Peace out!
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Old 06-15-2012, 06:49 AM   #76
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When you "Jump" a battery which side do you connect and disconnect first and last? The Neg. Why? A possible spark could ignite battery gases. At least that's what I was taught.
Peace out!
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Jeff,

When jumping a battery the final connection needs to be to the Frame of the vehicle (as far from the battery as possible) providing the "jump" so the inevitable spark will also be far from the battery.

You are not supposed to connect directly to both terminals of the jump provider's battery.

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Old 06-15-2012, 08:13 AM   #77
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My stabs and slide outs are wired seperate from disconnect. Always on.
But never travel with disconnect off.
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Old 06-15-2012, 08:19 AM   #78
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Originally Posted by f1100turbo View Post
My stabs and slide outs are wired separate from disconnect. Always on.
But never travel with disconnect off.
My stabs and slides can be disconnected.
I also have a "kill switch" on my stabs.
That makes a great safeguard for little hands that can cause hundreds of dollars damage by running the landing gear up with the aft stabs down.

Also with the landing gear killed, it will be MUCH harder to back up to and steal.

Never travel with the camper battery disconnected since you will not be able to use the breakaway safety system or charge the battery form the tow vehicle; as F1100turbo stated.
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Old 06-15-2012, 12:17 PM   #79
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Originally Posted by herk7769 View Post
Jeff,

When jumping a battery the final connection needs to be to the Frame of the vehicle (as far from the battery as possible) providing the "jump" so the inevitable spark will also be far from the battery.

You are not supposed to connect directly to both terminals of the jump provider's battery.

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Sorry, you misunderstood, and I was not clear. Allow me to clarify and be specific. When I stated the Neg, I meant a negative "connection", not specifically the Neg battery cable. Yes, you always "Jump" to the frame. Users put the switch in the Positive side of a circuit (myself included) because it's generally the simplest most advantageous solution to isolating a particular circuit. You have a power or positive lead running through out the vehicle, but the negative is generally a short straight shot to the frame, so adding a switch are other device is far simpler on the Pos. side.
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Old 06-15-2012, 01:48 PM   #80
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switch is on positive side
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