you will have to "run" them from the back of the radio to the trunk, there is no way around it unless you use a "line output converter" http://www.sonicelectronix.com/viewcat.php?category_id=331&sort_order=price_asc for the RCAs and you can find a wire that is only "hot" when the car is on but...
If you send too much power to your sub, you risk damaging it. The cone of the speaker and the mechanical parts that make it move may break under the stress. Surprisingly, too little power can also damage your subwoofer — in fact, it's actually more common than damage caused by overpowering...
what subs are they?
--comp
--CVR
--CVT
--CVX
--L5
--L7
--soloX
what kind/size is the box
--ported or sealed (bandpass)
--kicker brand box or off brand
--is it in the subs recommended cu.ft. range
all of this info is needed, after you find out what the stuff is worth new find it on a discount...
you will need a ground for it to work and you also need a "remote" wire which is a small power wire to tell the amp to come on (that the radio is on)
for testing you can bridge a small wire from the positive power connection to remote connection and see if it works also make sure that you have a...