About a month ago I decided to clean the.

About a month ago I decided to clean the terminals on my battery so removed the cables and cleaned them with baking soda/water and a toothbrush. It made a mess on battery and around battery (but clean). Within a day or 2 the post turned black. So cleaned it with wire brush and soft steal wool. Both connectors and posts were cleaned. Finally I decided I would charge the battery with my "Extreme Charger". It is recommended by manufacturer to allow battery to charge for about 3 weeks to fully clean plates and charge battery (battery was removed from van for this process). Today I reinstalled battery and cleaned posts and connections again. I triple checked to make sure battery was connected properly and it was. So I opened the door to my vehicle and interior light was not illuminated nor would anything happen when I inserted key in the ignition. I went to the hood and checked everything and it all looked good. I even replaced the positive terminal to for a better connection. Still nothing. I used my multimeter and it said the battery was at 13V. Is there a fuse or something some place I can check that is not allowing my vehicle to recognize there is a battery connected to the vehicle? Please help?