I have to take a few guesses here. If the idiot light is wired one side to ign so its hot when key is on and other side to the alternators little No 1 terminal (works also to supply excitation voltage plus prevent run on like if a diode is used) yes it works and glows as it sees a ground via the alternator when its not running as Jim better explained. As long as the No 2 sense voltage wiring is good and the ground is good, if the light glows dim when running Id suspect an alternator internal problem such as its internal regulator or diodes or slip rings etc but I cant say for sure just what....
John T (NOT an Alternator expert, Im only DC certified lol)
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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