After market Regulator wiring diagram 

1937-9  " Lucas Magdyno " Diagram

1960-62 - T110/TR6/T120 

Unit 650 - 1963 - 1970 

1971 TR6 - T120

Frame location of horn relay

Condensor fitment details

1971 T120 

1972 T120 

1969 Trident