this happpened to me on a quad i had with just one semi broken wire in the harness. sometimes it would connect and run and then it would just seperate slightly and i would be dead in the water! took it to the shop several times but they couldnt find the poblem off hand because evertime they check the harness it was making connection. finally one time went to shop to pick it up and it happened as the tech was riding it out of the shop and we were able to trace it! turned out the entire harness was getting brittle so we replaced the whole thing and no more problems!
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