common for power to imobalizing relay to be wired to constant power insted of ignishon. is a posability alarm should use 10 to 20 mah , bonet swich may if has 1 may turn on a interia light some whre to , clean top bat to. all may help / if bat back up siron ,is common for them to die and try to chage siron too , more to test , like they said try fuses alarm prob tapped into wireing behing key