bd197 wrote:
...however, ever few minutes or so the voltage decides to jump up to 18-19v for a few seconds then drops back to 14.5v for another few minutes.

...I remember thinking someone was flashing their lights at me! I'm wondering if this was the increased voltage hitting my low beam ???

Almost certainly the regulator/rectifier. You may be lucky with a poor connection on the harness at the reg/rec, but I'd put 50p on it being the the unit itself.
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Andy.
NSR-WORLD.COM

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