What high beam relay? None exists in this car.
There is a relay for the common pole, which is +12V permanent (& I'm guessing switched with the ignition because the headlights go out with the ignition off), then the output goes to a pair of fuses, then to the common pole of the headlight globes.
The other side(s) of the headlights go to the headlight/indicator/high beam stalk, which then goes to ground.
I do seem to have found a wire off the stalk which is +12V only when the high beam is on. I'll need to test it under the various positions to see if this is correct.
And I'm planning on running a fused & switched wire straight off the battery as a back up for the spotlights anyways. Bit easier when the battery is in the back seat.
Damn, there's a long route for the wiring in this car. Suppose that's what happens when you start something off as left hand drive & then convert it for RHD markets. Most stuff runs across the back of the firewall from the left side, then back across the dashboard.
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