> On my bone stock original TR4a the headlight switch, when pluued
> back to the driver will energize both the low beam and the high
> beam (only if the low beam is active as far as I can tell. I can
> not rule-out that it simply energizes the highs and drops the
> lows.) When I do this with the low beams on, I can hear
> something that sounds like a relay click under the passenger dash
> somewhere.
>
> Another non-original TR4a does not do this at all, pulling the
> stalk does nothing.
>
> I looked at the wiring diagram and I see nothing suggesting a
> connection to any relay. So, what is happening with the "flash
> to pass" function here?
Tony, it's my opinion that your car has been modified in this area. Both
the factory schematic and the one Dan Masters drew up say the "flash to
pass" feature does not work the way you describe on a TR4A or even on a
TR250. Dan's series of schematics show the "flash to pass" only energizing
whichever headlight beam was selected by the dipper switch up until 69 TR6;
after that it always energized the high beams even if the low beams were
selected. My 71 Stag is also wired such that it energizes the high beams
even if the low beams are selected.
But none of these show any relay associated with headlights.
> How do I make the non-original car function in the palsh to pass mode?
To make it function as original, make sure the green/brown wire is connected
from the "green" fuse to the flash contacts in the headlight switch (brown
wire). This wire should have power any time the ignition switch is on.
Check the brown/blue wire coming out of the switch, it should have power any
time the ignition switch is on and the lever is pulled to the flash
position. Of course, a failed switch is a definite possibility. The
brown/blue should be connected to the blue wire also coming from the
headlight switch, which feeds the dipper switch.
Since I prefer energizing the high beams as the later cars do, I would
possibly run a new wire from the brown/blue at the headlight switch to the
blue/white wire at the dipper switch. But it wouldn't be as original.
Randall
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