641 voltage regulator

(quoted from post at 14:45:45 01/27/13) I adjusted my regulator voltage output by increasing the spring force and my first attempt increased the voltage to 7.6 to 7.8 volts. This is above Jmor's specs of 7.1 to 7.5 volts. I will try to get within those specs but wonder what would fail with the voltage values above. Could the field coils in the generator and regulator stand these higher values or is it just about over charging the battery?
Another question on B circuit systems about checking the generator output. On A circuit systems, it is easy to just ground the field terminal taking the regulator out of the system and measuring the generator output. What about B circuit systems, could you just put full voltage on the generator field {after disconnecting the regulator} and measure the generator output, or is that too much strain on the generator field windings?

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(quoted from post at 15:38:39 01/27/13) Thanks jmor that is good information. I think lots of guys here will benefit knowing how to check out generators. In the case of B systems, I would only use the full voltage to field test for a short time to determine if the generator was at fault.
As far as the voltage over the spec in my case, I use the tractor seldom and not for long running times either. I might be satisfied using the higher voltages in order to keep the battery fully charged. I would not think a battery would be damaged in that way with charging voltages up to 8 volts even. I appreciate your input!

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