Which wire should I put a switch for my speaker system?

Hi, I had my motorcycle battery constantly discharging because of my JBL Cruise speaker system. and someone told me that it would be a good idea to put a switch so that current stop drawing from the battery. but I don't know which wire should I put the switch. is it negative wire(black) or positive wire(red)?... show more Hi, I had my motorcycle battery constantly discharging because of my JBL Cruise speaker system. and someone told me that it would be a good idea to put a switch so that current stop drawing from the battery. but I don't know which wire should I put the switch. is it negative wire(black) or positive wire(red)? thank you.
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