randy hall said: (quoted from post at 17:25:44 01/13/13) an electrican told me to never open the ground side.
In residential wiring, you switch the hot wire. The reason is because then you have a "hot" wire at the light bulb, even with the switch off, and you are a path to ground when you go to change the bulb.
On a vehicle, you ALWAYS disconnect the ground from the battery first as a matter of safety. If you go to unhook the hot post while touching the tractor, you get zapped. If you accidentally swing the wrench into a metal part of the tractor with the ground hooked up, you short out the battery. In extreme cases, the wrench can "weld" between the positive post and the tractor's frame. The short circuit can cause the battery to explode in your face.
This post was edited by mkirsch at 06:31:28 01/14/13.
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