If you hear clicks, your ground wire may be too close to a third brake light or bulbs. BUY A GROUP LOOP ISOLATOR if you are lazy.

http://store.autotoys.com > SEARCH UNDER GROUND LOOP

You using cheap wire? Heavy duty amp needs heavy duty wire. THIN wires will create noise because you are starving the amp..

and dont turn those gains up too high, just match it and keep it just about right before distortion. It may play louded at max but you are amplifying noise too.

Always good to test your system with the car on before FINALIZING you run of wires to rule out noise.

Good luck and my weekend is over (sigh)