I don't think putting subs in the cab doors is a killer idea, unless they're 8" subs, i don't think they'll fit.
nonetheless, heres how you wire them.
Take a subwoofer feed from the back of your head unit and run it to the amp. (its usually RCA connection)
You also need to run power from your battery to your amp. you should use some heavy wire since amps do pull a bit of power. I think 8 Gauge is the standard wire everyone runs.
Then, depending on the impedance of your speakers and the amp, you can wire them in different ways.
the most common way for single voice coil subs is to wire the positive and negative from each sub to the amp.
some amps come with a bass gain control input, those are usually separate and i mount them in the glove box just so they're out of the way.
I also would recommend buying new when you find an sub and amp. unless you know the power ratings and how long some of that stuff has been in the elements and what not, you may have more issues than its worth.
'99 4x4 Off-Road | 4.0 with 4.10. | 33x12.5R15 BFG A/T | Mickey Thompson Classic 3's
Originally Posted by 2004xlmiller
i can kill trees/deer/liberals or whatever i want now. its solid.