i have a same saturno 80 tractor the alternator charge lamp stay on all the time i had the alternator cheeck out and its work perfect.could anyone please tell me what i can do to fix the problem

tony mizzi, September 2007

Many alternators contain a small component called a diode trio. Unlike the 6 power diodes which convert the stator output from ac to dc, the diode trios sole function is to tricle a small amount of voltage from the alt output circuit to the side of the charge light not already hooked up to the bat or ign sw. Where an unaprised "mechanic" may pass the alternator on an output test , he may not be aware of the existance of the diode trio, eventhought that charging circuit is successfully keeping the battery charged up

Dirt Cheap, November 2007

Sounds like alt warning lite is chafed on a ground somewhere
could always put a gauge in and take bulb out of warning lite

bg, November 2007