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Something I know nothing about. Never had to touch one! Eating dinner now but will look at a diagram to see what it does later. In the meantime from the TM (5) Linear Reactor (Ll). Disconnect electrical connectors from control box. Use an ohmmeter to check resistance of each of the three...

If you cant get r17 to bring the voltage into rougly the middle of the sweep of the voltage rheostat/adjuster, then your VR is suspect. I have had them fail low on voltage, and have had voltage climb with load.

I am going to say for right now rotating diodes.... I would dig deeper into that, with the proper tests and if they look iffy replace them. Try again with the direct 12v battery test and see where your at before you yank it for a winding test.

I think its odd there is a problem with the flashing circuit AND that it is way under voltage with an excited field. Too much of a coincidence.....

I think we are getting warmer... I wont have access to the TM pdf's till tonight but follow the circuit. I know the main start swtich is in there, and those take a dump sometimes. Actually I had one on this laptop. This section overall is for you 2-10 or in your pdf reader hit Ctrl+f and...

For a test, you could just apply voltage to the exciter. I dont think a 12v battery would be over doing it. If you see voltage there, then yes move on, and try the diodes next, they are not too bad to check or replace.

Jim corrected me, it is a large resistor on the board. Dont post in delirum...... They do sometimes burn up. I have a couple toasty ones here. Edit..I see you already moved past this.... Good, kind of a pain to take that out anyhow :) I would check at the exciter as jim says. It is the end...

Make sure the field flash circuit is in working order, and flash it good. Check the capacitor on the bridge rectifier in the back of the 'reconnection box' as well.