David, Any luck with the headlight circuit?
I would try pulling out connections 87 from the dip and main beam relays. When you change from sidelights to dip you should be able to hear (and feel if you put your finger on the relay) the relay clicking over, the same should happen when you go to main beam for that relay.
If that's ok then I would check the changeover relay. If you can do a conductivity test, 30 should be connected to 87a when on no lights, sidelights, or dip (just to confirm that is based on continuity not voltage). When you turn the headlights on, the changeover relay should switch, and 30 should now be connected to 87. Make sure that 87 from the headlight relay (not 87A) and 86 are connected together.
Cheers
Dave
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