On the Alternator Connecto/Plug. You should get Battery Voltage all of the time from the 2 large Slots on the Connector that attach to the Fat Red Wires.

The single Small Slot that attches to the Blue Wire goes to the No Charging light circuit. When the Key is off you should get no voltage there. When the Key is on but not cranking you will get about 1 volt less than the Battery Voltage if the Bulb and circuit are OK.

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84 300D, 82 Volvo 244Gl Diesel