Hey guys...02 f150, started out tonite simply changing a low pressure ac switch...decided to change the battery as well. Had a 6 month old battery, barely used, installed it but it was dead. Hooked up the charger, the box that runs the brakes, near the drivers side fender, started buzzing. Unhooked it all, charged it awhile, then started it up. Still getting the buzzing sound from the brake box? {sorry I'm a carpenter} then all went downhill. Now no power inside the truck, no radio, fan, inside lights...I do have headlights and tail lights, brake lights. Still buzzing when I hook up the battery, but truck will NOT start. No windows, locks either. I checked all the fuses I could find, they all seem fine. Any ideas? Thanks!!!