Does your van have an ammeter or just an idiot lite for the charging system.
The hot lead on the alt goes to the "A" terminal on the regulator plug.
The "F" terminal on the alt goes to the F terminal on the regulator plug.
If the vehicle has an ammeter, then the wire from the ign switch goes to the "S" terminal of the regulator plug.
The "I" terminal of the regulator plug is not used with an ammeter system.
If this info is not sufficient you need to provide more info as to just what you have and what the charging system is or is not doing.
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