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Beresford SD | Follow Up:
The circuit which feeds 12V to enable the alternator has two parts. One is the AMP light on the dash, this bulb must be operational, failed bulb = no charge. The other part is a resistor under the voltage regulator, which supplements the current going through the bulb in the AMP light. My resistor was out, I was told normally this will cause rapid failure of the bulb in the AMP light, although such did not occur on my 706. I installed a new resistor and the alternator goes to charging voltage immediately. The high voltage was remedied by adjusting the spring tension on the voltage coil inside the regulator, I set voltage to 13.5 idle 14.0 WOT.
This system is, I know, obsolete by today's standards. The alternator on the tractor is not very old, and since the resistor cost (slightly) less than a rebuilt alternator I went that way, thus the system does work as originally designed. | |
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706IH no charging
