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Message: <blockquote data-quote="mgaidica" data-source="post: 256680" data-attributes="member: 546572">K, so i had to do a sub/amp install on a 2003 ford focus. The guy had basically all the wires you needed and wanted to keep the stock HU. Although ive done many installs, this was the first time I had to go through a firewall. This was actually simple, but I was so worried because I never did it, it took about 1 hour to just find a hole. So I ran the power from battery to the back, not to hard.. pop a couple panels and boom, ur done. So that was all last night... now onto the harder parts..I wake up calling around to find a Line Output Converter (to convert speaker level outputs to RCA, or low level). I find one and go back to my house. So i use HU keys to take out the HU. Now the tricky part.... I need a turn on remote and attach 2 wires to + and - of a stock speaker channel. I luckly have a digital multimeter so that helped. There was no stock wire diagrams for a 2003 focus online, so i had to test each circuit till I found a 4 ohm circuit. I then burnt off some wire insulant with my torch and soldered the + and - of the LOC to the speaker wires. I then turn on the car and test some of the stock wires for a 12v signal.. I find one, but it is constant, its on even when the car is off.. so i keep trying.. Finally I find a good one, its 0v when car is off and 12v when the key is turned to the first possition and on...  I nowrun the RCA's and remore down the opposite side of the car (so you dont have any signal problems).I hook up the subs, and attach everything to the amp, and presto, were in businesS! It was 2 kicker comps in a bandpass with a kenwood 1000 watt amp. Hit OK, not anything special though.. .Overalll it was tough, but i learned a lot. You can read all u want, and know all the written meterial, but until you get out there u wont know EVERYTHING.</blockquote>

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