Scott, I just dont really see the genny as loosing enough residual field pole magnetism over a short time as the problem and I say its NOT (or shouldnt be) standard procedure or the problem.
That leaves us with possibly a VR or a ground or connection problem. The next time you start her n she dont charge (and before you re polarize) try this:
TO DETERMINE IF ITS A GEN OR VR OR CUTOUT RELAY PROBLEM
5. a) VOLTAGE REGULATOR SYSTEM: With the tractor running, temporarily ground the Gens Field post to case. If she charges then but NOT otherwise, the VR may be bad, or a wires missing from VR's Field post to the Field terminal on the VR, or the VR isn’t well grounded.
b) IF IT’S A CUTOUT RELAY SYSTEM and she charges only if you dead ground the Field but NOT otherwise, its either a bad switch or the switch isn’t well grounded or else the wires bad or open from the Gens Field post up to the switch. INSURE THAT GOOD SWITCH GROUND AND WIRING
6. If she still don’t charge, leave the Field grounded and jump a wire across from the VR or Cutout Relays BAT terminal over to its GEN terminal (jump by passes the cutout relay) and see if she charges. If then but not otherwise, a VR's cutout relay isn’t working correct (maybe points burned/carboned) or a Cutout Relays NOT working or not wired correct.
7. With the 2 steps above, you have basically by passed the VR or Cutout relays functions, so if she still don’t charge, you're left with a bad battery or wiring or the Gen itself.
The next thing is if that temporary field ground gets her to charging and then she still works okay for "a while" without that ground, it still sounds like the VR needs attention like Jim was talkin about. It may need some minor tweaking or perhaps even a good clean/buff/polish of the relay contact points is in order.
Id insure BOTH the genny n VR have good grounds,,,,,,,try the tests I outlined above,,,,,,,,finally, Id try to clean the VR relay contacts and if youre brave enough try the minor adjustments Jim was talkin about.
One last thing Id do is try to clean up the gennys commutator free of carbon or oil and clean n exercise n light lube the brush hold down spring assemblies n make sure the brushes arent worn down too low and that the springys are keeping them pushed down tight against the commutator
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