I have to track this down this winter. I suspect my Alpine alarm system because the little blinking LED that says the system is armed occasionally blinks when I just driving around town...that shouldn't happen.
Yeah, I know I should just put a meter in line with the battery and pull fuses one-by-one until the power is no longer used, but what happens if this proceedure indeed "fingers" the alarm system? It was installed by the original owner, and by design it will be shoved into all the least accessible places of the car. Ugh.