Posted by sunsettractor on March 31, 2018 at 16:01:57 from (47.137.133.115):
Hello All, Last week there was a post in the JD forum about wiring a Genny on a JD 'D", one of the replies supplied an excellent link to a Delco voltage regulator manual. In that manual, it showed the correct way in which a 3, and a 4 terminal voltage regulator are wired. I have a 1948 John Deere BW, Iv'e owned for about 6 years, in that time, I have had charging issues on two occasions, both times the charging system troubleshooting pointed to the regulator being bad, it had a 4 terminal regulator on it when I got it and the regulators I purchased were also 4 terminal, the first was an inexpensive one, the last was a "premium" USA made version that was kind of pricey. After installing and polarizing the new regulator this last time, it did not charge, once again I checked all the connections, amp meter shows a discharge when lights are switched on, regulator base is properly grounded, then, when regulator field terminal was grounded, it starts charging, once again pointing to a defective regulator.....so, I call the supplier of the regulator, tell him what I just said, he says it is probably a bad regulator, and happily sends me a new replacement. So about this time is when I stumbled on the post about the JD D wiring, and the replies from our forum Guru's, and the manual on the Delco regulators, Then I decided to dig in to the wiring on the tractor. Even though there is not much to the wiring on the B tractor, It was put in plastic split loom and overly taped up,it was all contained in the loom, with the exception the terminals connected to the amp meter and the voltage regulator. I took the dash loose, which I had not done before, exposing the gauges and removed the harness and opened it all up. The light switch was wired off of the amp meter, and there was also a wire coming from the same terminal on the amp meter, going to the load terminal on the regulator, this according to the delco manual is NOT correct for a 4 terminal regulator, which I have been using. After installing my new replacement 4 terminal regulator and wiring it as per the delco manual, the tractor charges perfectly with or without the lights on,So.... After all this rambling,I have two questions; 1. Did I destroy the "pricey" USA made voltage regulator by installing it on a tractor with incorrect wiring ? I realize now that the "L" terminal on the regulator is the source to supply voltage for lights or ignition. Would running power from the amp meter to the "L" terminal cause damage to the regulator or generator ? If that's the case I need to get in touch with suppler and pay for the replacement he sent me, and if so; 2. Why did the first regulator I installed a few years back, work for a while and then give out instead of just frying like this last one ?? I Appreciate the Knowledge shared in these forums, and any input on this as well. Thanks...Tom
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