Bus Won't Crank, No Lights or Dashboard Gauges
My bus started and ran perfectly several times before I began demolition work on it and cut the wiring to the emergency exits, overhead lights, and speakers. After 3 weeks of demo work and not trying to start the bus, I turned the key in the ignition and I got nothing: no dashboard gauge movement, no lights, and no crank.
I tried to jump start the battery with my truck, but I still got nothing, so I tested it with a multimeter. It reads 0.0 volts when it's hooked up to the battery cables, but if I remove the battery cables it reads around 3 volts.
I'm going to replace the battery today, but there's obviously something else going on since it reads 0 volts the moment I put the battery cables on the posts. Any suggestions?