Masters degree credit available for alternator charging question

[hippieforever3]

I'm posting this here rather than the FC forum bcause it may be a
generic issue across models.

I've looked a few diffent versions of the charging / starting
schematics and can't find anything that explains what I'm seeing.

Consider this sequence;
1. Turn on master power switch in the battery compartment
2. Observation - dash voltage is showing 12+ to 13V, no current
3. Turn ignition key
4. Observation - dash voltage momentarily drops to 10.5V
5. Engine starts
6. Observation - Dash voltage rebounds to approx. 11.5V, no current
7. Momentary tap on the throttle, approx. 1500rpm or more
8. Observation - Dash current now showing +50a to 100a, voltage starts
to climb toward 13-14 volts

It's steps 6 - 8 that mystify me. I can understand the voltage
rebounding after the starter surge but why no current before revving
the engine?

This implies a relay somewhere that only kickes in after a little rpm
rev. I don't see it on any of the various BB schematics I've got. Is
there an internal relay in the alternator?

Has anyone else seen this or do I have some "custom" configuration?

Movin on,
GPSGary
1984FC35