i read your bench test starter thread and didnt understand what was going on so ill reply hear. just an fyi try to keep related posts together so people understand whats going on.. with that said..
it sounds like you may have a problem with your main power wire, your ignition wire or all that jumping fried the starter. even though the bench test worked its not under load so thats doesnt rule it out completely. see what happens when you hook a jumper wire off the battery to the small starter wire end. if it works fine when you give it power directly from the battery then you probley have an ignition wire problem. if that doesnt work then replace your main power wire going from the battery or fuze box to the starter. jumping a vehicle heats them up pretty good and if it was already corroded it eventually puts a dead short in the wire. it may look fine and still see 12 volts at the starter end but it cant send enough juice through it.
what does it do exactly when you have problems.. does the starter make any noises when you try to start it.. one click... multiple clicks or nothing at all each means a different problem.