Question about 1976 Yamaha XS 500

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Tt500 wireing First, Thankyou so much for your input,however i have only one wire comeing off the coil (no negative) two from the generator and one from the points. Any suggestions?

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I have edited the picture to show what to do.

  1. The power wire from the generator is wired to the points wire.
  2. The points wire and generator wire are wire to the coil +
  3. The coil is frame grounded when mounted.

Note:You may need to try each of the 2 wires from the generator(try one and if it doesn't run or run right,try the other wire,Since the energize at different times)

tt500 wireing - 57f2415.jpg

Posted on Jan 26, 2009

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In addition to the test above, you may elect to perform an ignition coil resistance check as confirmation of the coil's condition.

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You may have a bad coil or bad ground or wire connection

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