Did you change Headunits? I know when I did a similar custom install in my Avalanche, the interface I used to keep onstar and an aftermarket HU had 2 adjustments on it for output level.
I used products from www.go2pac.com
As far as the lights are concerned, I think you might have a loose wire or short and possibly a bad ground. You should check the PESWIX and make sure its grounded properly. These units are particular on how they get their ground.
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2002 Chevy Avalanche
2002 Chevy Corvette (585 RWHP)
2003 H2 Lux
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2003 H2; 37 inch BFG\'s, Manik Off-Road pkg., Airaid Intake w/MTI tube, Magnecor wires, Predator Tune, Custom Audio
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