Posted by John T on April 12, 2013 at 05:05:40 from (216.249.82.117):
In Reply to: amp gauge posted by Ellis Kinney on April 11, 2013 at 16:23:12:
Wayyyyyyyyyy back when I was a used tractor dealer it seems many/most older tractors amp gauges were rusted with sticking needles just as you described. However, so long as the gauge is still a continuous circuit as they usually were(an "ideal ammeter has ZERO resistance) just cuz the needle is mechanically stuck dont mean she cant still charge just fine. Put a voltmeter on the battery and when the tractors sittin there not running the voltage should be around 6.3/12.6 volts but when running at fast RPM IFFFFFFFF the charging system works voltage should rise to 6.5 to 7 on a 6 volt or 13 to 14 on a 12 volt. Additionally when you change from slow idle to fast RPM the lights should get noticeably brighter if shes charging.
If she dont seem to be charging (voltage isnt rising) see if it charges when running if you temporarily dead ground the gennys FLD post?? If so (means genny itself is okay) but she dont charge otherwise, the VR is bad or isnt well grounded or if it has the LHDB light switch (and cutout relay) its not well grounded or the wires bad from FLD on genny up to LHDB switch.
Sounds like you alreay tried my Troubleshooting Procedure, it should tell if non chargign is a genny versus the VR or other problem??
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