I just tried to install a new car stereo and got everything hooked up, but now the car won't start. I know it's not the battery because I had it unhooked the entire time and when I reconnected it the lights and everything work. The car just won't start. Could have to do with the car alarm? Please help!

 

Forgot to say it's a 2003 Mercury Mountaineer.

 

you may have to call the dealer to find out what the reset procedure is for your vehicle's alarm system. If using the fob to lock and unlock the vehicle doesn't work to give it a quick reset that is.