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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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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