I only have one key, no fob. Now I've charged the battery but as soon as I hook it up the alarm sounds. I've tried hooking it up with the key on, then with it off, and also with no key in the ignition, all to no avail. This was my son's car for several years and he didn't even know that it had an alarm. I changed the battery recently with no problem. It went dead for some reason yesterday and I tried to jump it but it set off the alarm. I just recharged it overnight, but it still goes off..