Quote:
Originally Posted by bevedfelker
The - side is ground. When removing power or disconnecting a power source it is always best to remove it's ground. Putting it on the + side means one side of the switch always has power -- so you could short out the powered side of the switch. Also great likelihood to get a spark when connecting the powered side of the switch. Good safety practice to engage and disengage the ground -- not the power.
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You will get the same spark regardless of which terminal you connect/disconnect. The only reason the negative terminal is preferred is to minimize the amount of exposed positive metal which could accidently be shorted to any common metal surface by tools, etc.