Posted by John T on May 12, 2013 at 15:35:10 from (216.249.76.176):
In Reply to: gernerator question posted by charlie M on May 12, 2013 at 14:43:09:
It needs to pass BOTH Genny Motor Tests. 1) If you ground the field and apply battery voltage across ARM and case ground and she spins good and smooth, the armature and brushes and bushings are likely okay 2) Then if when you remove the Field from ground she spins up, then likely the Fields are good and intact. If it passes BOTH tests it ought to charge.
With her running, if you dead ground the Field and she then charges (that says genny itself is okay) but NOT otherwise, the problems a bad VR or not well grounded VR or (on cutout relay and light switch control systems) the LHDB light switch isnt well grounded or bad or the wires bad from FLD on Genny up to the switch. If its a no light tractor with a cutout that has the F terminal, that needs wired to FLD post on genny, thats where Field gets its ground. If the FLD isnt grounded (VR or LHDB switch or F on relay) NO CHARGE
A good 6 volt battery ought to read 6.3 volts just sitting there and if hooked to a good working charging system at fast RPM it should raise to at least 6.5 up to 7+
The open unloaded voltage from ARM to case frame isnt as important as to what voltage the battery raises (per above), thats the REAL test, but if its as low as .2 unloaded shes notttttttt working.
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