Headlights / stalk switch
I am using the electrical schematic in my Haynes manual. Wiring diagram 18 for 1988 and on carb models (I have an '88 Mayfair, three clock).
I can't get the main beams to come on when selected at the stalk switch. When I use the flash feature they come on. I verified voltage through the fuse box, and voltage where I think it should be at the stalk, but get no voltage at the BL/W terminal of the headlamp socket when main beam is selected. Voltage is present when the flash is used.I am not sure I understand how the main beams work enough to troubleshoot more, though.
I can see on the schematic that the PU wire comes from the fuse box to the flash switch at the stalk. I see how when activated the flash switch continues the PU wire, which flows to the BL/W wire to the lights. I verified this operation and circuit continuity at the light socket. I see how the BL wire from the stalk, which powers the rear fog light switch, is either powered from the BL/R wire (when in dip beam) or the PU wire (when in main beam). What I DON'T understand is what the circuit path should be when the stalk is in the main beam position. In this position I only get PU to BL connectivity (power to the fog lamp switch), but nothing that seems to connect power to BL/W at the stalk. Is the stalk supposed to essentially hold the flasher in the "on" position when main beam is selected, thereby completing the PU to BL/W connection? Something else?
The stalk is a recent replacement, as is the dim/dip relay.