i got a new battery today, upgraded to more cranking amps. so i installed new positive and negative battery cables while i was in there too, positive cable was looking kind of crusty. hooked everything up, now gen light is on with no key. i had the same problem a few months ago, but it was the alternator, replaced it with a new AC Delco. i believe the test for that was to unplug the harness from the back of the alternator and the gen light would go out. tried that just to rule out the alternator, gen light still on. any ideas what it could be?