How old is the battery? It may be time for a new one. I always get AC delco batteries myself.
I'm with Greg on using a meter to troubleshoot with. If you don't have a light or meter. If you touch the positive connector the battery do you get a spark (Key off, doors closed)? Do you hear any clicks of relays engaging?
Your first post makes me think its just a bad battery connection. Even if its tight it might have a bunch of corrosion. I would make sure both ends of the battery cables are good and clean to shinny metal. Do you have a separate wire off the positive battery cable that feeds the bulk head connector?
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