alarm

hello.

i just purchased a 96 h1 and having issues with the alarm. i disconnected the batteries to clean all the terminals and replace harware. but after disconnecting the first ground terminal the alarm started to go off. so i removed the other ground and it stopped (obviosly). i finished removing all the hardware... replaced it and put it back together. but now the alarm keeps going off evey time i open the door or anything. unlocking and locking the doors does nothing (using door toggle) switching the ignigtion on and off 3 times doesnt work, even starting the car does nothing. keeps going off.

i bought the truck and recived just keys... no key fob. not sure if this is an aftermarket alarm or factory. anyone know what the factory system lookslike?

i appreciate any help.

-ED