Posted by pete 23 on April 19, 2017 at 11:26:08 from (45.52.60.246):
In Reply to: alternator issues posted by gary in neb. on April 19, 2017 at 06:33:27:
There was a rash of alternator problems from a supplier a few years ago. Would over charge like to 19 volts. Supplier would not believe the local mechanic until he put one on a tractor with salesman standing there, then switched to a known good one. I had a bunch of bad voltage regulators myself. Also, when at the dealer we had a bunch of bad stator windings. I would put in new stators and alternator would pull very hard, get hot, no charge. Put in good stators, worked fine. Don't believe it myself, but bad stator back in, same problem. Gave stators back to parts department and next time I needed a stator, here it was the rejected one back on the shelf, same problem. Trying to get warranty on defective parts was tough. GRRRRRRRRRRRR.
If I was putting it on , I would use my carbon pile to load batteries, have volt meter hooked on along with my good clamp over wire ammeter. Then would use temperature gun to see how hot that made alternator run.
Another thing that really messes up those three wire delco alternaters is the sense lead to number two terminal. A loose or corroded connection will kill an alternator right soon with up and down voltages. I have hooked a variable rheostat to number two terminal when I had the alternator on a test bench. Playing with that rheostat I could make a good alternator charge over 20 volts. That was to prove bad connections can make a good alternator and voltage regulator go nuts and they will drive you there sometimes.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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