yes, switch on, tractor not running, the light should be on.
When the tractor starts, possibly needs to rev up a bit, the light should go out. The indicator light tells you that the excite circuit (#1 wire) has power before the engine starts, then goes out to tell you the alternator is charging. Some wire the excite circuit and indicator through an oil pressure switch, so the circuit is broken when the stopped engine has no oil pressure. No chance of forgetting that and discharging the battery. Lots of two terminal pass through oil pressure switches used to power electric chokes or electric fuel pumps in pickups / cars. My 80 GMC 6 cyl pickup had one for the electric choke.
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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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