My jeep wont start and we are thinkingthatr it

it wont start because the alarm has been tripped.Go the the passenger side door and unlock it two or three times with the key.The alarm will shut off and you will be able to start the jeep

insert your door key into the drivers door when the alarm is going off;
turn the key and the alarm will reset

Try disconnecting the battery for a few minutes. JUST THE NEGATIVE TERMINAL (BLACK)!!! DO NOT TOUCH THE POSITIVE TERMINAL WITH THE NEGATIVE CABLE STILL INTACT!!!!

How exactly is the alarm stopping the jeep from starting? Is the alarm going off, siren blasting? Is the red led blinking or solid red?

Use you key to lock and unlock the tailgate as the alarm is sounding. The alarm will shut off and vehicle should start.

put key in driver side door lock and unlock it should turn off the alarm and you should be able to start it, it will do this anytime the power is distrupted or if you unlock the jeep from any door other than the driver real pain....

Alarm Module Reset Procedure
NOTE: This information applies to a Vehicle Theft Security System (VTSS) that was armed when the battery was disconnected and reconnected.
When the armed VTSS senses that the battery has been disconnected and reconnected, it enters its power-up mode. In the power-up mode the alarm system remains armed following a battery failure or disconnect. If the VTSS was armed prior to a battery disconnect or failure, the system will have to be actively or passively disarmed following a battery reconnection.
The power-up mode will also apply if the battery goes dead while the system is armed and battery jump-starting is attempted. The engine no-run feature will prevent the engine from starting until the alarm system has been actively or passively disarmed.
Passive disarming of the Vehicle Theft Security System (VTSS) occurs when the vehicle is unlocked using the key to unlock either front door or the lift gate. Active disarming of the VTSS occurs when the vehicle is unlocked by depressing the Unlock button of the Remote Keyless Entry (RKE) transmitter.
Once the alarm has been activated (horn sounding, lights flashing, and the engine no-run feature), either disarming method will deactivate the alarm.
Depressing the Panic button (if equipped) on the RKE transmitter will also disarm the VTSS, but the horn will sound and the lights will flash for about three minutes as part of the Panic feature. The horn and lights can be stopped by pressing any of the RKE transmitter's buttons or driving the vehicle above 15 mph.

I had an aftermarket alarm on a Wrangler and encountered the same problem. With the car off I disconnected the battery, then pulled the fuse(s) for the alarm. I waited to reconnect the battery for about 10 minutes because the computer can hold memory with no power source for a short amount of time. (I did not put the alarm fuses back in.) This disables the alarm, but atleast the Jeep started.

Replace the crank sensor.