First explain security light on a jimmy never heard of a security light on a jimmy.head lights/turn signals/emergency flashers/dome light/bed light but never a security light.. Possible causes broken wire,loose connections,undercharged battery,short in the bulb,bulb loose in socket. There are many things that can cause lights to blink /brown out/die.even the bubl itself now adays can cause it to flicker,flash faster,stay on when it shoudl be flashing or blinking. I just replaced my tail light bulbs for my turn signal becasue they were not using the proper power so they flashed at a much faster pace than they were made for.once a new bulb was put in the flasher they worked perfect again and at a normal speed.just as a example of a bulb going bad and needing replaced.I just replaced my dome light festoon bulbs with leds to also fix a power outage/dying light bulbs.