I need to hook up a amp to high input. No RCA jacks on 2005 F150. Negitive to Negitive ( Right ) and Positive to positive ( Left ) or can I use just one speaker to hook up the wires? I just want to know if one speaker hookup will work???

 

Which wire do I hook my amp upto on the high input side??. My amp is a 2 channel that I'm using as a 1 channel sub amp.