Dipped & main beam relays are switch earth at the light switch, not switched +12v.
When I altered the wiring for mine I did it by inserting a relay. I put the relay in the power feed to the foglight switch, with the earth for the relay coil being switched through the light switch.
That way the power to the light was still switched on with the side lights, but the relay wouldn't become live until the lightswitch was was in the main on position.
I'll see if I can find a diagram to explain what I mean, and post it up.
Cheers
Gus
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