Andrew, The bulb in the warning light only has to cope with about 14 volts, max.(in a 12 volt system) Yes to change from 6 to 12 volts, those things need to happen. A volt meter only indicates the voltage, an ammeter indicates current flow.
There are three elements: Voltage, Current and resistance. (Amps, Volts, and Ohms) each affects the others.
Think of it like water.
Pressure comes from the head (height of the water tank)= Voltage.
Current (flow) is dictated (limited) by the diameter of the pipe, and limited by the restriction as in a tap. (or as in the resistance filament of a bulb)
Mike, you might well be right about some systems. I don't know.
However in the case of the carriers I believe the ignition warning lights have 6 volt bulbs and would require a 12 volt bulb if the carrier was converted to 12 volt.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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