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)
Ammeter 8-0-8 CZ27
 Domed glass, pointed bezel, illumination through apertures in rear side and reflector
8-0-8   CZ27,
flat glass, rounded bezel, no illumination
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  
Horn HF935 HF1235  
Horn push button 4A or 40SA  
Battery (Lead Acid) *1 Lucas PUW7E Exide
(Nickel Cadmium)
  Lucas C105  "Ni+Fe"  
Voltage regulator
 "Lead Acid"
MCR1  L12 (1940 and up)  marked "Lead Acid" MCR1/L32?  no marking!
Voltage regulator
MCR1  L9 (1936/37) and MCR1  L5 (1938/39),   marked "NI-FE"  
Battery carrier straps Lucas part without cross brace straps from Lucas with cross brace  
Magdyno MO1/4/AG4 .  
Dynamo E3H.M.L/O (Anti Clock) from 1937 onwards  
Clips to fit wiring to frame Terry's    
Wiring connector*2 connector  Lucas (571395)    
Immobiliser 1941 and later *3   Immobiliser  
Suppressor*4   Suppressor  

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. 

*1 Batteries of 12 Amp hour upto early 1940 but marked 10 Amp hour after that.
*2 Wiring connector is shown in same Lucas catalogue under given number.
Three wiring connectors were applied on the early bikes. One in the + lead approx one foot distance from the battery, one approx one foot from the regulator "A" lead and one in the tail lamp lead for easing the disconnection of the rear mudguard end piece for better access in case of removal of the rear wheel. It is not known whether the connector in the "A" lead was applied on all bikes over time.

*3 DME circular B.125, "Immediate action", 21-7-1941, Provision for immobilisation, All M/C's,

*4 Suppressor not certain if and when applied, example was found on almost unrestored machine from March 1939 firmly believed to be left behind in France in 1940.


Page will be completed when more detailed pictures are available.

Wiring connector, picture courtesy Pat from Australia