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Diagram modified for 1951 - 1953 R51/3 and R68.
Harness available from Bench Marks Works, pn 61 00 8 066 027
Color mm term From term To
Red (fused Battery +) 2.5 51 / 30 Headlight 51 Generator
Blue (Generator Field) 0.75 61 Headlight 61 Generator
Brown (Ground) 1.5 31 Headlight 31 Generator
Red / Black (Mag Kill) 1.5 2 Headlight 2 Magneto
Black ( + horn, break ) 1.5 15 / 54 Headlight 1,K1 Horn
Black ( -  from horn) 1.5 H0 Headlight 2, K1 Horn
Green (Neutral lamp) 0.75 15 / 54 Headlight Lamp Headlight
Black (Neutral lamp) 0.75 Lamp Headlight switch Neutral Contact
Black (Battery +) 1.5 30 Battery (+) 30 Generator
Brown (Tail -) 0.75 31 Headlight 31 Strip(-)
Green / Black 1.5 1, K1 Horn   stop light
Green / Black 0.75   Strip   stop light
Black (Tail light +) 0.75 58 Headlight   Strip
Black (Battery -) 1.5   Battery (-)   Transmission Ground

 

A: Biluxlampe = Headlight Bulb
B: Standlicht = Parking light
C: Tachometerlicht = Speedometer light
D: Ladekontrolleuchte = Generator light
E: Leerlaufanzeige = Neutral light
F: Abblendschalter = Dimmer switch
G: Horndrücker = Horn button
H: Signalhorn = Horn
J: Zündmagnet = Magneto
K: Zündkerze = Spark Plug
L: Lichtmachine = Generator
M: Seitenwagenleuchten = Side car lights
N: Steckdose  = Plug socket
O: Bremslicht  = Stop light
P: Schlußlicht  = Tail Light
R: Bremslichtshalter = Stop Light Switch
S: Leerlaufkontakt = Neutral Contact
T: Batterie = Battery

Kabelbaum = Wiring harness
Farbe = Color
von = of
nach = after
rot = red
blau = blue
braun = brown
schwarz = black
grun = green
scheinwerfer = headlight
klemmleiste = strip
Lichtmaschine = generator
magnetzunder = magneto
bremslichtshalter = stop light
masse = mass
getriebe = transmission
leerlaufschalter = neutral switch