Assuming that this system has the original external voltage regulator?
That blue wire on the square plug feeds 12 volts to the light from the alternator end when charging for the purpose of shutting the light off (voltage applied to both ends of the bulb filament = 0 current flow and no light).
If that terminal is grounded inside the alternator (as in a diode blown allowing a back trickle to ground), the light will stay on even tho the alternator chages just fine.
I'd sure check the diodes in the diode trio; betcha one of 'em is leaking.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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