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Ducati 450 scrambler 1975 converted to 12v with Luas Rita AB11 electronic ignition it is so easy to start with this modification I put a new original alternator 3 face that gives up to 55v at 5000rpm a new original reg/rec output 14v and the problem it is not charging the battery do you think that I have to do a diode after the battery or something?

Thank and I appreciate for help.

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  • If I was you, I would get a cheap voltage gauge (or multimeter), hook it up to the battery, and rev it up to a normal riding RPM. The gauge should read between 13.5-14.0. – sam Feb 17 '19 at 1:23
  • Also, you might find this guide helpful for troubleshooting. It is for Suzuki GS bikes from the same time as your bike (I have a '79 gs850). Though the exact voltages for your bike may differ, it gives you a very good idea of what should be happening – sam Feb 17 '19 at 1:30
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So a “new original” alternator - 6v or 12v..

You put a 12v ignition system so the battery needs to be 12v and so does the alternator and the regulator.

If those things are mis- matched then they won’t work, it seems lucky that it runs.

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