How to disable ford alarm system?

I've been trying to install a aftermarket stereo in my 2006 f150 king ranch. It just won't crank when it's all wired in. I was told it's because of the security system or the factory sub. When I put in the factory stereo back in it would crank right up? Any ideas?

1. Does your vehicle have PATS? Meaning, did they mention it has a chipped key? You know this if on your Dash there's a "theft" light that illumiates.

2. When you install the aftermarket stereo does the theft light come on?
The theft light or PATS is activated if it is blinking fast. If this is the case, insert your ignition key and turn to ON, not crank. Just on. Wait for the fast blinking light to slow. Takes about 30 seconds, then turn key off, and remove. Wait 15 seconds then re-insert key. Turn to ON, not crank. Light should blink two time, stop two times, Stop, etc, this means PATS is OK, if it blinks fast, connect the stock radio and try again.
If you find the Stock radio is OK but aftermarket is not working, well that is very strange. That would tell me somehow the stock radio is tied into the Bus line between the PATS and the ECM.
I at that point would call Crutchfield or such and ask them. They would know for sure. But I can't find any documentation to support your issue, but that doesn't mean it isn't happening.

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