Best to remove the Black(negative) first, then the +(positive) cant complete the circuit if you shorted out the + .
Reverse to install.
Just make sure thiers no greenish corrosion on your cables ends. If thier is scrape it out and you might use some baking soda and an old tooth brush to clean them up.
Then you can buy some electrical stuff to protect them from this, they sell it autozone in tiny square packages.
OH YA!
Might use some safty glasses when cleaning that crap, sucks real bad to get in your eye(s)
