Disconnecting the battery cable while running it not a good way to check an alternator. Doing so will damage the alternator and if you where to get in line with the cable you take off and ground it can KILL you. Disconnecting it like that makes the VR got to max charge and max volts so it is putting out 35 plus amp which is 35 million time the amps it take to kill and max volts can be 90 plus which is more then enough to push the amp to kill you. Just plain and simple a stupid way to do it.
Correct way to check is a volt meter check and a magnet test. Battery volts should read 12.5 plus not running and 13015 volts running. Magnet test is simple also the back of the alternator center should be magnetic when running if not then it is not being excited as need to work
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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