Posted by Janicholson on June 11, 2010 at 10:12:53 from (199.17.6.76):
In Reply to: alternator update posted by karl f on June 10, 2010 at 23:05:08:
If the tractor has a ACC terminal on the ignition switch, and if it will excite cleanly with 12 v no light bulb hook it up that way to the #1 post and all is well (assumes proper voltage regulation when running and charging, and no drain on the battery to speak of. >10ma. If you need the light to be shown on the dash, it may need a new regulator. Does the light come on with the key on and not running (like it does in a car)? if not it will not work.
The regulator appears to be a ground to the exciter current from the key (this is what makes the light come on). When the regulator excites the alt, the terminal goes to 12 volts (thus applying 12 volts to both leads of the light). If it will not excite without full 12 volts, no light, there is no way to make the light work. Jim
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