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If the lights on your sub box aren't coming on it's either your ground of power wire came loose or the transformer blew. As for the subs, make sure all the connections are good, especially on your RCA wires. If your amp is getting power, then check your speaker connections. Also, make sure to turn the gain know up. The gain knob is located next to the RCA input on the amp. Let me know if this helps.
Wire the power connection from the amp to the fuse box that is only live when the ignition switch is switch on and or the accessory is on.
When the ignition switch is off then there won't be any power to the amp. Connect this power lead with its own in-line fuse and on the power side of the fuse box before the fuses.
well yeah thats what im doin riht now in my ford taurs what u do is u can hook up your 5x7s and ur 6x9s on ur amp sill have room for a sub the way too do that is get the front speakers off the amp just run the back andsince its a four channlel amp 1 and 2 channel are used for the back and 3 and four are used for thesub of couse u brige the sub to the amp 3 and four are used for the sub hope that helps friend let me no what happens