security/electrical problem on 1996 Jaguar XJ6

i have a 96 xj6 when you lock or unlock the door it do not beep no more it use to beep but not not more and now the security light came on when i drive the car the security light stays on.i checked all the fuse and battery everything is good.sometimes it wouldn't start.maybe after 3 to 4 hrs it start sometimes it take days to start.does anybody no what the problem do i fix do i reset the alarm system.and what happen if you have an after market radio.

Asked by for the 1996 Jaguar XJ6
Did you find out why your Jag wasn't starting? Was it related to the alarm system?
i have an aftermarket radio that i installed with no problem but the security system problem you have is the same for me but it started before i changed the radio and i had no problems with the radio
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