I think Grant is bang on, that it is a voltage reducer. The resistance needs to suit the load. Macs have them for individual instruments, 12 volt to 6 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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