Posted by pete 23 on December 01, 2011 at 19:22:46 from (74.32.238.142):
In Reply to: Farmall 12 Volt issue posted by Scott Limbourne on December 01, 2011 at 18:47:12:
There are only two possible reasons for excessive voltage. One , easiest to check and repair is the sense lead that goes to number two termial. If that connection is not good , meaning making a tight clean connection to the spade on the regulator, your voltage can be all over the place. I used to play with those connectors while running alternators on the test stand. I found that if I inserted a variable resistor (pot) in line from battery to number two I could get readings way up to 20 volts. Seems backwards as one would think a poor connection would lead to lower voltage but IH had sent out a bulletin warning of these conditions. Therefore, if that wire and connector are good, check the main wire all the way to battery. Other problem would be alternator itself. Some times the current draw through the field (rotor) seems to destroy a regulator. I have had about three alternators that I replaced regulators, rotors, diode bridge, diode trio (everything but the stators) and they still over charged. Different alt and problem solved. Also, there has been a rash of poor quality regulators in the parts systems.
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