96 GMC Sierra SLT RKE Alarm issues

My 96 GMC Sierra started this problem where the alarm wouldn't disarm and it would intermittently go off without reason. Now it goes off when I turn the
key switch to start the truck and the truck won't start until I disarm it with the unlock button on my remote keyless entry. It is like it is stuck backwards. Active when the keyswitch is on instead of off. I have tried removing the battery cables for a reset of the system but this hasn't helped. Can anyone give a poor soul some help on this annoying problem?
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