1979 Triumph Bonneville T140E Wiring

Reader Contribution by Keith Fellenstein
Published on March 8, 2017
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Bonneville wiring

Q: I have recently acquired a pristine original 1979 Triumph Bonneville T140E 750. It has been in storage since 1981. I am having difficulty getting fire to the plugs. This bike has a Lucas pointless system and I haven’t been able to find a manual that provides info for this particular system. I’m relatively certain the ignition module is shot as there is no fire at the spark plug. There is power to the module. Without specific info concerning the Lucas components, I cannot be certain what to replace or not. So far, I haven’t found the “E” designation on any of the manuals I’ve researched. It’s my understanding that is the emission compliant version for the model years 1978 through 1983, hence the electronic ignition. –  Dale Lawless/via email

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