Many a times such issues cause tough problems.If alarm will not disengage,then car will not start.So to start the car the alarm has to be disengaged manually.
If the truck has an after market alarm system , then they usually put a by-pass switch under the drivers side of the dash , it should be a small black push button switch.That when found you can push and hold in and then try to start the truck, use a flash light under the drivers side of the dash and look around for this switch , it should not be hidden , you should just be able to see it if you get to that eye level .On some ford car models its red color button.
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If the truck has an after market alarm system , then they usually put a by-pass switch under the drivers side of the dash , it should be a small black push button switch.That when found you can push and hold in and then try to start the truck, use a flash light under the drivers side of the dash and look around for this switch , it should not be hidden , you should just be able to see it if you get to that eye level .On some ford car models its red color button.
This details will help.
Thanks.
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