A passing light feature was an option for B110. If your turn-signal lever has a push-button on the end, it's the passing light switch. Push it in, and the headlights activate while it's pushed in (regardless of whether lights are on or off).
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Passing Light Switch
This is composed of two parts:
- The switch itself is part of the turn signal (on the steering column).
- The relay. 1200s don't use headlight relays, except for this optional Passing Switch. It looks very much like the Horn#Relay.
- 25230-89912 RELAY-passing lamp (4-connector relay on early models)
- 25230-89905 RELAY-passing lamp (3-connector relay from 1971 Apr)
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Wiring
Note that this Passing Lamp just wires in series with the standard wiring. From the 'L' fuse to the high-beam wiring, the switch bypasses simply the regular switch, firing the Main Beams.
Passing Light Switch circuit. The red circle indicates the part of the T/S switch that is different from a normal T/S switch
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