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The green wires are for signal input to the included amp and should be connected to a pair of RCA preamp outputs on your head unit. The thin blue wire connects from "remote" on the amp to a switched 12V output on the head unit (usually blue or blue/white). The red wire is for power and goes through the fuse to positive battery. You also need to connect the amp terminal marked "ground" to the metallic chassis of your vehicle, within a distance of about 1/2 meter or less. There's usually a short piece of wire with black insulation included in most amp wiring kits. If your Fusion sub did not come with such a wire, you can use any wire that is the same gauge (or bigger) than the red power wire.
The best place is to go to any store like halfords or maplin, or a lot cheaper if you wanna wait is ebay, many fusion amps/ active subs need special wiring !!!£80 from them direct only way, or you can go to maplin and get this product: A21GF (power supply extender 24pin) then cut off the three columns you need and the top and bottom of each are the respective 12v positive input remote and earth, cut the wires off half way and twist the top and bottom together, then add the twisted wires to your normal sub cables. make sure you use insulation tape around the naked wires for quality and stop it short curciting
check the impedenc on amp and speakers.if speakers have lower ohm the amp cant push them also can cause damage to amp.how do you have everything wired must be specific.high level inputs,rca,.how is the radio and amp wired together,where are you getting power sup[ply from and how? email@example.com