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Scott,
If you check voltage using the two wires coming off the stater & connect to the rectifier you will get A.C. voltage. Do not disconnect but ground 1 lead from the meter & contact the other to the rectifier lead in post. You have two connections from the stater, check each one separately
Your rectifier may be flakey too. You should always have a slight voltage increase running thru a rectifier or diode. What you have is a bridge rectifier. It has four connections, Two connect to the A.C. voltage in & output is full wave D.C. positive & negative. The third terminal is positive & the ground, mechanical bolt up connection is the 4th connection. Check alternator output on the AC scale & rectifier output test with D.C. scale both on the 50 volt scale for starters.
I’m glad you found a bad pump, Now get a Mercury squeeze bulb to keep a good flow going. Mercury pumps are good as long as the rest of the system is in good shape & no vacuum leaks.
The Mercury charging system has no regulation. For this reason the output is lower so the battery does not over charge & cook itself.