I was wondering if there was an accepted best-practice of which side (+ or -) to break with a manual switch for simple on/off control of 12V DC.
A power switch usually switches the positive side.
But a lot of automotive applications switch the ground.
A light switch in a house switches the "hot" side and the neutral remains connected.
The "nature" of transistors & MOSFETs usually makes it easier to switch the low/ground side.
Since voltages below about 40 won't shock (most people), it doesn't matter, 120 or 240V surely WILL, that's why it's switched HIGH (HOT) side.
The cheap power FETs are all N-type.
You can get burned by 12V quicker than 5V but an amp of either will get your attention and if applied the wrong way, kill.
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