Charging Issue

Mattax said

Not sure what you are measuring here. volts to ground?
If the ignition side of the regulator is not getting power with the key on (should show same voltage as battery) then there is a bad connection between the regulator ignition terminal and the key switch. This is assuming there is a good connection to the key switch from the battery and the alternator.

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Concentrate on ^^this^^ here. have you recently made changes to the ignition system? There is only one wire coming through the bulkhead connector that supplies underhood loads in the key "run" position. THIS IS NOT FUSED. Depending on the year, the dark blue (usually) "ignition run" wire feeds ignition system, VR, electric choke if used, smog devices if used, etc.