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Farmall & IHC Tractors Discussion Board

Re: Generator system on 12 volt Neg ground IH 140


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Posted by John T on March 29, 2010 at 10:24:34 from (71.55.30.174):

In Reply to: Generator system on 12 volt Neg ground IH 140 posted by Davida on March 29, 2010 at 10:06:52:

Sometimes if the genny isnt Polarized to match the battery it can harm the VR and/or burn or stick its contacts, sure you had the Genny properly Polarized BEFORE you started the tractor???

Some VR"s are polarity sensitive suitable only for Pos or Neg Ground while others will work at EITHER, you have any idea on the new VR??

As you mentioned the VR requires a good ground to work corect, make sure yours is.

This is taken from my Troubleshooting Procedure, it tells how to full field the genny and essentially by pass the VR to see if she will charge then, Id try it next AFTER you make sure the VR is grounded,,,,,,,,its suitable for your polarity,,,,,,,,Polarize again to be safe,,,,,,see what happens

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.

Now if all fails heres my complete Troubleshooting Procedure

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=jd&th=304795

John T



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