I believe the switch to coil ignition on the Series D Vincents prompted the switch from negative ground to positive ground.
Positive ground with coil ignition was found to produce a better spark using 6 volt system, the subject of much discussion.
Here is a early MO36 that is probably Jan-Feb 1948 as the only Dynamo is the PR24 =3½ Miller.
Shows the negative ground system.
Positive ground with coil ignition was found to produce a better spark using 6 volt system, the subject of much discussion.
Here is a early MO36 that is probably Jan-Feb 1948 as the only Dynamo is the PR24 =3½ Miller.
Shows the negative ground system.
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