Do you know what alternator is installed on that tractor? I thought they were all internally regulated at that point and there was no more battery temp sensor... but obviously if the sensor is installed, I'm incorrect.
I'd start by checking wiring and making sure that there's an excite voltage coming down the indicator light's wire with the key on...

Rod
 
(quoted from post at 13:58:50 11/16/13) I thought 1991 was the last year for a 7810

The regular, made in the USA, 7810 was made from 88 through 91, but the 7810S (made in Mexico) was made from 93 through 97.
 

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