So I have 94 vn 750 have Replaced the stator. l put bike back together did spark test to ground front coils spark great, back coil no spark. I taken small Screwdriver to frame and I get spark every time but with spark plug no spark, But every once in a while it will spark. Took test light and tested green wire going to coil and flashes as is getting power. Took black wire from front coil attached to back coil and spark !! Coil works fine. I've Omed tested everything by manual all looks good. Cannot figure why back coil not firing right. Any ideas?