Re: JD LA generator output question

Posted by John T on May 13, 2021 at 05:52:19 from (45.16.200.171):

In Reply to: JD LA generator output question posted by fpappal on May 12, 2021 at 15:53:06:

The Motor Test described in my Troubleshooting Procedure can show if the genny itself is okay, if it passes BOTH tests it should be okay.....

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.

Your question With tractor running should I get around 6v from the F terminal on Genny?

The gennys output is on the ARM post and frame/ground NOT the FLD. If running but the FLD isnt connected to where it gets a ground (such as Low High charge light switch or a VR) the residual magnetism in the iron field poles will still yield some output (across Arm & Ground) but the FLD needs a ground for charging purposes.

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 isnt well grounded.

b) IF ITS 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 isnt 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 dont 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 isnt 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 dont charge, you're left with a bad battery or wiring or the Gen itself.

John T

Replies:

• Re: JD LA generator output question fpappal 17:16:33 05/13/21 (0)

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