Start by checking all fuses, relays and fuseable links, you can buy continuity checkers at most autoparts stores.
The spark arcing wouldn't cause any problem. The spark doesn't care if it goes to the spark plug or the engine block, so we can eliminate that.
Now, for the lights to stay on when the key is out leads me to believe there is a problem with the itnition switch itself. I would start there. (Let me know if the head lights, horn. Things that work without the key are still working)
Joe
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Saturday, November 20th, 2010 AT 5:46 AM