My 70’s Ford truck uses a mechanical voltage regulator to adjust the alternator’s field coil current depending on the engine rpm & how much battery charging needs to be done. No problems with it, just curious how that gadget works. Anybody here monkeyed with those things?
It’s very simple in design, has two relays in it, the field relay, and the voltage adjuster relay. Inputs are the battery voltage, and the voltage from the ignition switch. The only output is the field voltage. It seems like when I turn the ignition switch to “run”, that always causes the field relay to close. The voltage adjust relay looks like it determines the field output voltage, and seems to switch only between three selections: the battery voltage, a reduced battery voltage (but always the same %, determined by resistors), and 0 volts (for when alternator output isn’t needed presumably).
How frequently does the field voltage from the regulator switch to a different value? Every few seconds? Or just occasionally, like every few minutes? Or is it constantly adjusting the field voltage w/some means I haven’t discovered?
Edit: Here’s a link to a photo of the schematic