Posted by Andy C on November 24, 2012 at 14:49:37 from (71.175.88.133):
I bought a Marquette 39-100 battery charger at a sale yesterday. It appears the rectifier is not working. I get 12 volts DC output at maybe a few amps but if I switch the voltmeter to AC I have about 6 volts. Took the rectifier off and it looks as if it has been hot. The transformer has aluminum windings but does not appear to have been hot. I didn't pay too much for this thing but would like to learn to troubleshoot. I would also like to understand HOW a rectifier (like the one that has plates in this machine) works. The plates appear to have a soft metal coating. This one also has a center tap which is wired to the one side of the output the other 2 wires go to the transformer. Is this the 6 volt/12 volt part of the system. Thinking I know about just enough to make trouble but gotta try to learn. Thanks, Andy
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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