What is on the other side, although that says input there should be wires on speaker output,
just make sure as well that you have got a 12v live to the remote
you should have
12v + RED
ov - BLACK
Swithced 12V + (usually Blue)
if you not got a remote wire and just want to check it works before feeding one down loop a wire from 12v red into the remote, (this will leave the amp perm on so can flatten battery if left in this method better to use remote if poss, if need more help take a pic of other side as well, so i can see other terminials