You have a factory amp apparantly. I suppose you got a wiring harness since you are hooking the factory one back up. Look in the instructions for that wiring harness and find the one that says "remote on/off" or "amplifier on/off" or something along those lines. Hook that up to the blue wire on your headunit the "remote" wire. It should work just fine then.
"I'm not driving too fast...just flying too low"
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
90 7up vert - new project-07 DSG Focus -DD