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Join Date: Jan 2011
Location: Smack in the middle of Illinois
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What year model? Wiring is different from year to year: 89 was by itself, was the same for 90 to 92, 93 was unique, 94 to 97 was the same, then 98 to 2000 was the same, but if it's a 98 to 2000 with a cooling fan, it has a unique CDI unit.
My initial thought is that you may have lost 12v + on the blk/wht wire to the CDI unit (grounding the gray (reverse light) wire back feeds 12v to the CDI unit). It could be that there is a bad connection from the wiring harness to the CDI unit or the CDI unit is defective. That part of the ignition system appears to be the same for all models.