Posted by Red Mist on May 02, 2008 at 15:24:54 from (208.61.168.224):
Howdy, boys.
First, let me say I have read virtually every post from BobM. and John T. for the past 2 years about trouble shooting charging systems. Many I have copied and kept in my mechanical files. Maybe I'm a poor reader, or maybe ..... I don't know, except I cannot figure this one out.
It ain't charging.
1953 SM; 4-post regulator; 6V positive ground system. New battery, fully charged and tested. Running at WOT I get about 6.3 volts on my multi-meter across the battery posts. If I turn on the lights with the engine off, the ampmeter reads negative - so the amp meter is not wired backwards. If I jump from the gen to batt terminal with the engine running, I get an "off the chart" negative on the meter. I have polarized the gen at least 6 times (I know how - I done it on my SA and SH). I took the gen to the shop today and they tested it - including "motoring" - and it passed with flying colors. I have another generator on the shelf and I substituted it; it made no difference.
I did continuity tests on the Fld and Arm wires to make sure they did not get switched at the generator posts. They checked out right.
I am beginning to wonder if I have a bad gauge AND a bad VR - except when I jumped from the GEN to the BATT terminals on the VR, the voltage reading on the battery did not increase. Of course, the jumper wire got hot quickly and I had to disconnect, so that may account for no increase in voltage reading???
I removed the cover to the switch box and pulled the front cover and wiring out of the box to study it closely. The wiring is an exact match to the diagram in the SM Operator's Manual.
Boys, I need a little help from my friends. Show me some mercy here, please. All I can think of now is what an old man told me when I was a young man, to wit: "Son, if you want to live to be as old as me, don't fool around with electricity or married women."
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