The lighting works on a switch, as the boot closes it pushes a plastic rod
down onto a base plate which turns the power off, open boot rod moves
downwards allowing power to come on. I would have a look at teh actual
switch and see if it is either broken or damaged. They are cheap enough to
replace. As for the alarm, vibration seem sto be your problem, i dont like
the snap on wire joiners, the ones where you crimp a wire connector onto the
wire, the boot wiring travels along the floor to the back of the car, nearby
is also the boot release mechanism, feet can cause hassles as the wires
travel under the carpet and maybe have been touched ot disturbed. I buy
brass like connectors and solder the wire to the brass connectors for a
firmer connection. Some where along your wiring harness there maybe a short
or vibration maybe setting off the alarm when the 2 wires are joined. I own
a 1986 Diamente or Magna here in Australia and some models do have a small
wiring problem that can easily be fixed by proper wire connections.

Hope you had a good new year and also hope you fix your problem

Peter
Australia