Quote Originally Posted by 2rotor
it sounds to me like your battery terminals on the cables suck, you didnt say if you cleaned the cable ends either (at the battery and chassis/motor), you just said the engine chassis had grounds and they were firmly connected.
also, have you tried bypassing the ignition switch to rule it out? maybe just putting a voltmeter on the terminals to make sure you have ~12v in and ~12v out where it should be.
i did try cleaning the posts on the battery but it could be the connecting terminals, not really sure, so i'll get down the Advance and pick up some new ones. i think they're only like 5-10 bucks, so it shouldn't be to bad.