The three switches are labled as follows from L-R, T-B
1 Off, R.S.Head
2 Off, Side
3 Tail, Off
Switch # 1 is for turning your RS Headlamp on or off indepentanly from the other headlight.
Switch #2 is for turning off the side/"parking lights" in both headlights. If you look at the early wiring diagram the headlights are shown with two bulbs in each unit. The main bulb would be your standard driving and the side would possibly be your blackout one or low light one.
Switch #3 is for turning the tail lamp on and off.
However keep in mind these are to allow the driver to operate the lights somewhat independantly from each other. You would still have to use the main light switch below the ignition switch. On my wiring diagram is has a note pertaining to this.
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Note re C.A.V. Switchbox : The first position after "Off", side and tail lamps to be on. The second position after "Off", side, tail and headlamps to be on.
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What makes this confusing to me at least is that the first position is only labled at "T" and the second as "S & T"
The wiring diagram in the Maint. Manual is for a later style of Mk1* wiring. There are only two switchs on the dash and the third is moved to the back to control either the tail or the new addition, a convoy lamp.
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Note re Main Switchboard: The first position after "off", tail and dim lamps to be "ON" The second position after "off", tail, dim and bright lamps to be "On" Tail or dim lights may be isolated with toggle switches.
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