Electrical equipment

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Part "Early" "Later" Alternatives
Head lamps DU142/CVC
(7" aperture, flat difusa glass or Black Out mask)
(6" aperture, flat difusa glass or Black Out mask)
Tail lights MT110 L-WD-MCT1-V6  
Sidecar lamp  RC 330  
Dipper switch 9 Lucas part number  (to be corroborated)  
Axle floodlight (Big4 only) L-WD-AF1  
Lighting switches 4 pos 1/2 charge U39 (3 pos.) RS39 (4 pos.) U39-L15  
1/2 charge resistor 1/2 charge resistor 1936  
Ammeter 8-0-8   CZ27
(Some prewar machines had domed glass)
Horn HF934
(Only on very early machines)
Horn push button 4A or 40SA  
Battery (Lead Acid) Lucas PUW7E Exide
((Ni Fe) Nickel Iron)
Lucas C105, Exide, Chloride Electrical storage company, Alkaline batteries, NiFe Batteries Ltd.
(NiFe batteries have an individual cell voltage of 1.2 V thus requiring 5 cells instead of 3 as used for lead acid batteries)
Voltage regulator
 (Lead Acid)
MCR1/L12 MCR1/L32?
Voltage regulator
 ((Ni Fe)Nickel Iron)
Battery carrier   Norton part no. 3816 , straps from Lucas  
Magdyno MO1/4/AG4 .  
Dynamo E3H.M.L/O (Anti Clock) from 1937 onwards  
Clips to fit wiring to frame Terry's    
Rear light wiring connector* connector  Lucas (571395)    

Due to conflicting information between spare parts lists and Lucas catalogue, there is a margin of uncertainty in this list.
Lucas catalogue gives dipper switch as shown on this web page to be used for the Big4 and 16H between 1937 and 1954. It gives the 2 screw fixed switch as being used on 16H, Model 18 and Big4 from 1945 to 1954. Pictorial evidence however shows 1939/1940 military motorcycles using the screw fixed version dipswitches, before being deleted all together at the end of 1940 and being replaced by the 4 position headlamp switch RS39. Original 16H 1 inch handlebars can be found with the screw holes in them, for the attachment of the switch. 
Wiring connector is shown in same Lucas catalogue under given number.
* apparently there was also such a wiring connector at about 12 inch distance from the + terminal of the positive battery lead going to the Ammeter.

Page will be completed when more detailed pictures are available.

Wiring connector, picture courtesy Pat from Australia