Mark, I think you need to ohm out the gennys Fields because I think they have a problem, Im tired its late so im just gonan lay some theory/thoughst on you versus re reading n try to answer everything just as asked, sorry.....
Depending on your meter (Im not handy with fanchy schmancy digitals, I like my old Simpson 260 Analog) Id expect very low ohms from ARM to case cuz the armature windings are solid copper..
However from FLD to case should be the series sum of the armature (near zero) PLUS the two series Field windings which Id expect to be maybe 3 to 6 ohms (ie a few ohms at least but NOT zero) UNLESSSSSSSSSSSSSSSSSSS theres a short such as ,,,,,,,,,the Fld post insulation is broke where it passes thru the case (from overtightening),,,,,,,,,or one of the windings is shorted to the iron field poles,,,,,,,,or theres a short where the 2 field windings splice in the middle.
To test the fields (ohm out) more accurate you need to remove the armature or just insulate (or raise) the brushes so they dont contact the commutator then
There should be like 3 to 6 ohms from FLD post to ARM post and NOT open cuz thats the 2 windings (each side) in series.........if its an open (Thats BAD) circuit suspect where the two splice in the middle.
Its should be an open circuit near infinity ohms from FLD or ARM to case (with armature out of circuit) If it shows a short from FLD or ARM to case, the fields are shorted, either one of the windings to iron pooles or where they splice in the middle OR OFTEN the FLD post pass thru the case is shorted out
Id expect the open unloaded genny output (but depends on RPM) to be maybe 20 to 30 volts BUT ITS WHAT VOLTAGE WHEN COUPLED UP TO A GOOD BATTERY THAT COUNTS in which case a batt setting should read 12.6 volts but once coupled to a good charging system rise to 13 to 14 n over volts. Im saying that open un0loaded voltage on the Gennys ARM post to ground dont mean all that much
ITs NOT the VR that cuts the gennys voltage down,,,,,,,its the fact its coupled up to the battery via the VR's cutout relay that loads down teh gennys voltage.
A VR functions by regulating the gennys fields current sooooooooooooooo if the fields are bad its not gonna regulate
I will check with ya tomorrow when Im not so tired, theres more to say but Im going to the bed lol
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