For the life of me I can’t tell if this alternator in my parts bin has an internal voltage regulator or not.

 

No markings on the case unfortunately.

 

How can I know for sure?

 

 

 

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Looks like it does.  Looks like a ZX alternator.  The P terminal is a sign, plus the missing plastic vents on the back.

ZX - internal

https://www.rockauto.com/en/moreinfo.php?pk=37579&cc=1209293&pt=2412&jsn=389

1976 280Z - external

https://www.rockauto.com/en/moreinfo.php?pk=37404&cc=1209226&pt=2412&jsn=448

Thanks Zed Head, appreciate the reply.

Next question…

Seeing as I have a 280zx alternator with the internal regulator, I’m going to eliminate the external voltage regulator by adding the MSA adapter: https://www.thezstore.com/product/178/alternator-upgrade-adaptor-70-72-240z

But what about this random diode shown here in the picture. What’s it for, and is it ok to unplug it as well?




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That is not a diode. It is a capacitor referred to as a condenser. That is on internally and externally regulated alternators. It was incorporated to reduce electrical noise for the radio.

If you have an older stereo, keep it. If you have a newer stereo, you may not need it.