| Listed in parts books | Not catalogued by year yet |
ZENOR DIODE (NEG-GROUND)
A negative-ground Zener diode, part 49589, used to shed excess charging voltage on British bike electrics.
This is a Zener diode for negative-ground electrical systems, part number 49589. The catalog listing calls it a ZENOR DIODE (NEG-GROUND), which is just an old-fashioned spelling of Zener diode that shows up in a lot of parts books.
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A Zener diode of this type works with the alternator to bleed off excess voltage once the battery is charged, so it acts as a voltage regulator of sorts. It usually mounts to a finned heat sink somewhere on the frame so it can shed the heat it generates while doing its job.
We don't have much else on file for this one beyond the description itself, so if you're not sure whether your bike runs positive or negative ground, give us a call before you order to make sure this is the right polarity for your setup.
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