The EQ should have a yellow(+battery) wire, a red(ignition) wire and a black(ground) wire. Hook up the yellow wire to a constant 12 volt source. and the red wire to a switched 12 volt source, the black wire should be grounded to bare metal of vehicle chassis. There should be several pairs of rca's marked in/out. Run rca patch cables from output on h/u to input on EQ. Then from output on eq to input on amplifiers.