im still stuck on the part where you said you hooked the + to the - or - to + to reset the ECU. I tell you one thing, if you tried hooking up the battery backwords for some reason there are a lot of things you may have fried.
Disconnect anything he hooked up and test it. I'm leaning towards the terminal connections. They should be scuffed up with sandpaper or a wire brush and tightened down really good.