Daryll
It seems to me the resistor is wrong, and when you turn on your light, the power is going via the circuit to your coil. The bulb is acting as the resistance in your circuit, which just so happens to give 4.2 volts to the coil.
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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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