Posted by John T on June 11, 2011 at 05:30:05 from (173.243.189.183):
In Reply to: Grounding Generator posted by equeen on June 10, 2011 at 19:38:26:
The term "Ground" or "Grounding" on those old tractors refers to how the tractors iron frame is used as the return current path for current to the batterys grounded post (thats Pos on old 6 volt Farmalls). If the batteries POS is wired to the frame, then if an electrical device (genny or VR etc) is also wired to the iron frame, current can flow to the grounded battery post via the conductive iron frame instead of having to run a seperate wire
The genny must be Grounded to the iron frame via its mounting bolts,,,,,the VR or Cutout Relay must be grounded to the iron frame often via its mount to the genny itself or else on another iron component.
In your many postings lately you use the terms cutout relay and you also talk about a device having BAT ARM/GEN and FLD terminals which sounds like it may be a full fledged Voltage Regulator?????????????? If its a Voltage Regulator its BAT wires to load side of ammeter (and that wire MUST have hot voltage all the time if its wired correct),,,,,,,,,,,,,,GEN/ARM on VR wires to Gennys FLD post,,,,,,,,,,,,FLD on VR wires to gennys FLD post,,,,,,,,the VR MUST BE GROUNDED. If its a VR theres no wire from FLD on Genny up to a LHBD light switch
If it has a Cutout Relay,,,,,,,BAT to load side of ammeter,,,,,,,,,,,GEN/ARM to gennys FLD post,,,,,,,,,THE GENNYS FLD WIRES TO A LHBD LIGHT SWITCH NOTTTTTTTTTTT THE CUTOUT RELAY
OKAY ONE MORE TIME
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.
8. MOTOR TEST. You can Motor test the Gen. If its grounded and you remove the belt and apply hot battery voltage direct to its ARM Post and have the Field Post dead grounded to frame, it should motor n run well (Armature n Brushes and Commutator likely okay). Then, if you next remove the Fields ground and it speeds up some, the Fields probably good. If it passes both those tests, it should charge, and if not, it may be a wiring or battery or grounding problem. The hot battery voltage may be taken off the VR's BAT terminal or the starter post or the battery itself for this test.
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