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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