Car Alarms: 1997 F-150, fcc id, 12 volt

Question
My fathers F-150 was passed down to me when he passed away.  The truck is in excellent condition but it had been sitting there for 5 months and the battery was dead, so I had to replace it.  There is a remote on the keychain and I was told that the remote needs batteries.  So I went out and bought batteries for it and the alarm is not working when I try to arm it.  Did I deactivate the alarm when I switched out the batteries on either the truck or the remote?  If so how can I get this alarm working again?  The alarm has a name on the front SECURITY GEAR and the back says 1989 RABBIT SYSTEMS INC.  FCC ID: EN5RMTSB2000  I appreciate any help with this.  Thank you

Answer
CLOSED FOR THE DAY AUTO RESPONDER:

Hello & sorry but I am away from my desk
for the Evening.

Please restate this inquiry at my 12 volt
installers Forum at www.INSTALLSUPPORT.com .

I am certain that this will be solved
for you there within a couple of hours.
Good luck.

ALARMTEK