I never have that problem if I use a diode instead of a light. The ammeter immediately moves to the charge side.
I'm pretty sure that the reason is because of the voltage drop across the bulb (12V) vs. the voltage drop across the diode (<1V). There's no voltage left to excite the alternator with the light configuration.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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