Kizorm 
The thick wires are +12power and ground red and black respectively.Originally Posted by Kizorm
The RCA's are the input for the not installed amp, of course. The blue wire with the RCA's is the remote turn-on line. I assume they are connected to the HU. That Kenwood has a "subwoofer mode" for the lone set of Line level RCA outs. Probably just a filter only deliver low freqs.
Dunno what the 2 sets of black/clear wires are for. Are they connected to anything ?? Some GP's have 4 "speakers" in the rear deck. Maybe they split a 4ch amp between the subs and the deck speakers originally.
Which makes no sense.
Also peeps use the speaker <high> level outputs and tap into them for an input source for a sub. But there are line level RCA's right there, which is a cleaner signal.
So that also makes no sense.
Maybe they run to the door speakers.
Do all the "stock" speakers work now??
What's your budget?
Get a 1.2 cu. ft. Sealed box. Throw a Dual Voice Coil 12" driver that is 2 ohms per tap in it. Spend $150 on a 2 channel amp that is a decent brand and 2 Ohm Stable...throw a 1 MFD stiffy cap on it for giggles. Call it a day.
