JD A Voltage Regulator

[Randy K. Crump]

JD A 1951: Generator rebuilt and new voltage regulator (VR). Polarized VR and would not charge. Took generator and VR to electric shop. Don't know what he did, but it charged fine. Three weeks later, VR will not charge. Polarized, and still will not charge. Is there an adjustment I can make inside the VR? I know the generator and battery are fine. Thanks!

 

[wore out]

(quoted from post at 20:30:13 09/07/21) JD A 1951: Generator rebuilt and new voltage regulator (VR). Polarized VR and would not charge. Took generator and VR to electric shop. Don't know what he did, but it charged fine. Three weeks later, VR will not charge. Polarized, and still will not charge. Is there an adjustment I can make inside the VR? I know the generator and battery are fine. Thanks!

Make SURE the regulator base is properly grounded (NO paint or rust in the mounting area). The generator, as well.

You say you've polarized it, now "full-field" it by jumpering the generator's "F" terminal to a good ground.

(IF it then charges it will charge heavily, don't operate it for very long "full-fielded".)

 

[John T]

First of all its the Generator that is polarized not the Voltage Regulator and do it BEFORE start up to avoid VR damage if polarity is incorrect. I have seen where a shop has the genny polarized for NEG Ground and then if you install it on a POS Ground tractor without first re polarizing you damage the VR. If you work through my Troubleshooting Procedure it can help diagnose the cause of non charging. It includes the Full Field test to determine if non charging is the fault of the genny or VR or otherwise. You simply dead ground the gennys FLD post to see if it charges then ?? If so but NOT otherwise the genny itself is okay but the VR is either bad or not well grounded (check that, BOTH genny and VR need good grounds !!!) It also has the Motor Test to check the genny. I hope you didnt damage the VR already caused by incorrect polarizing !!!!

Give this a try

https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=ttalk&th=2060825


John T
John Ts Charging Troubleshooting