Alternator or battery?

[SteveJ]

20 minutes ago, Mark Maras said:

 There is a pair of adjustable points inside the cover. Back in the mid seventies I began to be concerned with a dip in the voltmeter at idle. Armed with no volt meter, little knowledge, and a repair manual, I pulled the cover off and adjusted one set of points. Don't remember which set and I don't remember if I opened it or closed it but it worked. Try Googling "Datsun voltage regulator adjustment".

Better yet, look at the EE section of the FSM. If you have an original points-style VR, the procedure starts on EE-23.

Keep in mind that the voltage is dependent upon engine speed and ambient temperature. The chart in the FSM is for 2500RPM.

You said the voltage was 14.45 @ 2000 RPM. Given that the temperature was probably between 50 and 60, I will repeat that I don't see a problem. With only the engine running, you're not pulling much current aside from topping the battery back off and firing the ignition. Swap the brake lights and turn signals to LEDs, and you probably won't see the ammeter needle move much of any time.

[Zed Head]

If you get in to the VR and find that you're maxed out here is an option to consider.  Get an external voltage regulator that goes to 11.