Question about Triumph Bonneville Motorcycles

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Coils are hot to the touch

Mild resporation on t120 bonneville. thought I had it when A. it wont start, and B the coils are hot to the touvh.... Appears to be wired correctly/per mannual....

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Hi and welcome to FixYa,

Offhand, am not familiar with a T120 Bonneville. However to my knowledge, there would only be 2 possible reasons why the ignition coil would heat up as you described:

  • the - terminal of the coil is wired to the ground; or
  • the CDI/igniter is shorted or in older designs, the contact point/condenser is shorted to the ground. On the contact point, it is also possible that the gap is erroneously set that it would appear to be shorted to the ground.
Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 21, 2008

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