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Eureka!
Turns out, the wiring diagrams in the Service manual depict the printed circuit board in two places. In one drawing, it shows the circuit one way, and in another, it shows it differently.
When I ignore the drawing on page 4-3, and wired the board as in 4_2_1, magically, the system works. Annunciator lights come on when the switch is off. Adjusted each regulator to 28.0v to give 27.7v (book value with load on). And it all worked. Test flight soon to confirm.
Still have a jittery ammeter, but at this point, I'm willing to live with it until annual when we bring this airplane into the 21st century and install plane power R1224s and an EI Voltmeter/ammeter and pile all the ancient diodes and resistors and capacitors in the middle of the ramp and set fire to them.
That is, if I can convince the local FSDO to play ball and sign off my 337 form.
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