Positive or Negative to Battery switch

joshuajim wrote:
Perhaps this will enlighten some folks.

Here

the person who wrote that document should be fired, you need 2 wires to complete a circuit, both sides of the circuit will use the same amount of power. PERIOD.

NPN transistors are primarily used for ground switching as they are not dependent on the voltage of the circuit they are powering, but are able to use the voltage of the micro controller, generally a 3.3v or 5v reference voltage, where as PNP transistors are switched on the positive side and must match that of the circuit they are powering.

i really didn't want to go into that. needless to say everything i said in regards to switching the power on either side changes nothing in regards to arching or amp usage, the general reason they switch ground is the reason i listed above

D.E.Bishop wrote:

Bill & Kate wrote:

Try TorkLift Power ArmorTorklift

Thank you Bill&Kate, Cool looking functionality. Like I thought it is more trailer oriented that MoHo oriented.

Google "trailer tongue storage box." They have angled sides that match the A-frame angle in a TT. Available in different dimensions and steel, plastic or aluminum. Can sit on top of the A-frame or between the A-frame tubing. I think these look nicer than a square storage box.

opnspaces wrote:

The claim was that by disconnecting the negative side of the load there was less arcing hence the components would last longer.

That makes zero sense...

Perhaps this will enlighten some folks.

Here

LittleBill wrote:

SCVJeff wrote:
Someone please explain how this works because I'm missing it completely.

Other than the wiring economics of switching negative to the frame, as in door switches, I fail to see how it saves life or arching.

it doesn't the same amount of current flows through the positive and the ground, thus the arch will be the same.

there is a reason why circuits are switched via ground generally, but it literally has nothing to do with fuses or current capacity

fuse the positive, like everyone does and move along

THANKYOU..
Its not like I haven't done this since I was 10, but mebbe someone dropped by and changed physics when I wasn't looking

Why would there be more of a spark from the positive side than the negative side?

NinerBikes wrote:
I was trained to always disconnect the negative pole or ground pole on any automobile battery first, except for some retarded british sports cars that had a positive ground, instead of negative ground.

Based on that, I'd disconnect the negative side,

When disconnecting a battery, you are using a wrench. If you bump the wrench against the body while taking off the negative, nothing happens. Once the negative is disconnected and you bump the wrench while disconnecting the positive, again nothing happens. If you start with the positive and bump the wrench, sparks fly!

Disconnecting the circuit on either side with a switch will break the circuit. Now if the switch itself has large, exposed terminals installing it on the negative side will eliminate the chance of an issue from accidental shorting to the frame.

I was trained to always disconnect the negative pole or ground pole on any automobile battery first, except for some retarded british sports cars that had a positive ground, instead of negative ground.

Based on that, I'd disconnect the negative side,

You switch the negative if you are turning something on and off repeatedly over a period of time; i.e. a vehicle being transported by boat from Europe or Japan. There will be no arcing at the contacts. You switch positive to take the fire hazard out of the equation. All racing sanctioning bodies require that your master switch be on the hot or positive side. Once this circuit is broken there is less chance a spark can be generated during the extraction of the driver if the jaws of life or a power saw are required.
Randy

SCVJeff wrote:
Someone please explain how this works because I'm missing it completely.

Other than the wiring economics of switching negative to the frame, as in door switches, I fail to see how it saves life or arching.

it doesn't the same amount of current flows through the positive and the ground, thus the arch will be the same.

there is a reason why circuits are switched via ground generally, but it literally has nothing to do with fuses or current capacity

fuse the positive, like everyone does and move along

Bill & Kate wrote:

D.E.Bishop wrote:
It looks like this has pretty well played it's self out, however, I have a question. I have looked for a description of a Torx box without luck. Being that the discussion is about a TH and I'm more familiar with MoHo's, I kindda figure it has to do with towed RV's rather than powered RV's. Anyway, searches provided nothing but ads for TOXR wrenches.

Try TorkLift Power ArmorTorklift

Thank you Bill&Kate, Cool looking functionality. Like I thought it is more trailer oriented that MoHo oriented.