So, I crossed my polarity in a 2002 is300. Battery was put on backwards and then turned over the engine. I went ahead and changed all the fuses and relays that were blown, the computer, but still have no spark. Any ideas on how to get my ride to fire back up? Could it be cool packs? If it is, is there a way to ohm them out to test before I buy all 3 and still possibly have a problem?