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You know with the exception of the M1010 - the CUCV is a remarkably simple vehicle, both mechanically and electrically. You just have to remember that they are 30 years old now and prone to deferred maintenance that'll crop up in the middle of the least ideal timing. Only way to "prevent" this...

Sounds like a fusible link is missing somewhere - can't "brain" much more than that - work is melting mine...

Gen1/Gen2 lights are controlled by the field power provided by the regulator. The positive side of the bulb is powered by the ignition for Gen1, and by relay controlled by the ignition (and hooked into the 24V's upper 12V battery positive) for the Gen2. The lamp is connected to the field coil...

If the exciter is not turning on the field the Gen2 light will not go out - if you rev the engine does the Gen2 light go dark? Still sounds like you cooked the regulator for now...

What ya did there by not having that insulated spacer was convert the isolated ground alternator into a non-isolated ground alternator. As soon as you hook that up you short out one of the batteries... :burn: Fix this before you even think about starting to replace fusible links. You may have...