A SIMPLE test is to disconnect the alternator completely (tape up the loose wires to prevent letting smoke out of the wiring).
Does the battery then stay up?
If it is a 10SI-style 3-wire unit, the #2 terminal will aways be "hot", key on or off.
The #1 MUST be only "hot" with the key switch "on", or when there is engine oil pressure, if the conversion is set up with an oil pressure switch.
Even if it is a manual-shutdown diesel, it's a good idea (despite what some alternator "experts" will tell you) to have an "idiot lamp", a resistor or a diode in the lead to the #1 "switched excite" terminal, as this will prevent alternator damage under certain conditions. (Having to do with a loose wire or even a little resistance in the circuit between the alternator's large output stud and the battery.)
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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