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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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