Have an 07 trailblazer. The battery was draining every day. Put a new battery in, changed the alternator. Still draining. Used mutli meter and checked every fuse in the hood and back. Found that the ignition switch was drawing voltage. So we changed the ignition switch and now the car will not start, it won't even crank over. Any help on this? Note that the car started and ran before this just the battery was being drained!