Jim Becker said: (quoted from post at 20:27:29 12/20/09) Most regulators are (or were when new) labeled to indicate voltage. They were also labeled for polarity, if it mattered. The marking may be stamped in or printed on. It is usually on one of the mounting brackets or somewhere on the bottom side. Most Delcos have it stamped into one of the mounting brackets. There will be some combination or 6 or 12, maybe a V and maybe a P or N. Maybe be POS or NEG. Might say "P 6V" or simply "12N".
There is a troubleshooting procedure on a web page. I don't have the pointer handy, but somebody usually posts it on any charging problem thread. I would expect a 6-volt regulator to test as "bad" if mounted on a 12-volt system.
One quick test is to directly ground the generator "F" terminal. Check voltage at the "A" terminal. This bypasses all the regulating function of the regulator and should put the generator at full output. Check voltage at the "A" terminal. If this voltage is above what you measure at the battery, the regulator is bad.
I am assuming you have good grounds everywhere, including the generator shell and the regulator.
I will pull the VR tomorrow.
That is what I am worried about. I hate to toss a good VR. I find it hard to believe it could only last a handful of years.
That makes sense. Field to tractor frame to ground it out. Check voltage at Arm by touching one lead to arm and other to ground. Sounds like I need an extra pair of arms!
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