I have a 2000 Astro AWD. It is an off lease vehicle and wasn't treated very well. When it rains for a period longer than 12 hours, weird things happen to the electrical system. Last time it was the door locks, locking and unlocking on it's own. They would cycle 4 or five time a minute. Now is the fan and the A/C cycling. I also noticed that I am missing a high beam and have checked all the fuses and the bulb?