It's your LOC...
Go with the correct C2A-CHY Pac-Audio box for your WK.
This magic box is plug and play and provides you with a remote 12 volt output, as well as two pair of RCA outputs.
It goes inline between the amp and the radio and gives you unfiltered output to the RCA's. The downside is that you will lose bass control, unless you have an amp with a remote gain control. I haven't noticed a problem running this setup in my SRT8 Charger. It sounds damn good
Visit the pac-audio website and look up the correct box for your car, then visit eBay and buy it! Right now, they are going for about $80, shipped.
Generic LOC's don't play well with our CANBUS based audio network
Hope this helps,