62 Valiant 200 / 170 cuin /6 - Odd smell - then dead battery

B. Since there are a few ways that could happen, eliminate the regulator.
View attachment 1716090716

If it keeps running, then its something to do with the regulator.

Can also work from the other direction using the test where the engine ran and the alternator produced power. As long as its one change at a time.


First thing I would do is repeat the above.
a. Measure the voltage at each end of the ballast resistor.
That's going to reveal which end is getting supplied power with the key in run.
Tell is what the measurements are.
b. If the jumper's aligator clip is on the side connecting direct to the coil as shown in your markup, move that alligator clip to the other side of the resistor. (It can be done with the engine running although it will likely spark ).
Measure the voltage on both ballast resistor terminals.
c. Finally, if its alternator is still producing power and the engine is running, disconnect the jumper from the regulator's field terminal and connect the aligator clip to the regulator's IGN terminal.

Now, between the previous test bypassing just the regulator, and these teste of the wiring all of the possibilites have been covered.