Switch the Negative? Fuse the Negative?
In a simple DC circuit consisting of a battery, a fuse, a switch, and a load, does it matter if the switch or fuse are on the positive side of the battery, or the negative?
Electrons flow from negative to positive, right? But I usually see the fuse and switch on the positive side of the battery.
Would someone set me right on this. It would solve a wiring problem if I could put the main battery cut-off switch between the battery and the load on the negative side.
Thanks for any help you can give me.
for a circuit that simple,
it makes no difference where in the cricuit the fuse or the switch is.
I would like to clarify the statement made by Matt. The statement is correct however, the switch should be nearest the battery then the fuse in the same wire. The reason the switch should be first is so when changing the fuse the switch can be turned off thereby disconnecting that side of the battery from the fuse. Just a safety thing. I would also add the use of a frame ground, plus or minus, would require the switch and fuse be on the opposite pole of the battery from the frame ground, again a safety issue. Here are some illustrations;
Grandpa Chas S.
switching the negative side of the modules for the paktrakr is exactly how i turn mine off on my emax.
thanks for the correction.
i keep forgetting that point, on the battery packs i tend to wire, i put one or more contactors in the middle of the pack depending on voltage. so correct placement of the fuse(s) isn't something i have to worry about very often.
I don't know if this enters into the equation, but I know that for a brushless controller, Kelly's anyway, the last thing you want to do (literally) is disconnect the ground. If I glossed over something, mea culpa.
Can anyone clarify this 'connected to the ground' thing.
Neither of my wires from my battery or to the motor are connected to the frame etc? With rubber tyres this wouldnt be connected to the ground anyway?
Please help me understand this
Frame grounding is not repeat NOT needed on a bike or scooter. This is something normally done on automobiles. There is no requirement to ground the frame on a bike or scooter, the only reason I said anything about it is, I am never sure about every vehicle out there. Maybe some manufacture will use the frame as ground. If this happens then you have to use the ungrounded side as you power on and off. If the vehicle in question do not use the frame as ground then don't worry about.
One example I can think of on a bike is the little generators used to power lights. The ones that are spring loaded and place a roller on the side of a tire to generate the power as you peddle. Have you ever looked at these closely? There is one wire going to the lights and the bike frame is used as the second wire to complete the circuit. This is one time when the frame is used as a ground on a bike.
Grandpa Chas S.