question WW2 CAV Switch Boxes

[thedawnpatrol]

Hi All

 

Does anyone know how many types of the CAV ignition/lighting switch boxes they produced ?

i have 3, all look the same from the front, but on the back each of the connections are lettered, but they vary ? why ?

 

if you look at several 'standard' ww2 british types, ie Morris, Bedford, Humber, Fordson, they must all have had the same equipment, but nearly all wiring diagrams show different connections being used.

 

anybody an authority on these ?

Also does anybody sell these still ?

 

cheers

 

Jules