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I've been driven to look at the manual. The "pass" switch sends a feed to the main beam live side regardless of the position of the dipswitch. So both dip and main beam should illuminate when you press that switch - both bulbs if the relays are fitted, the alternate one to the dipped beam if they are not.
The dipswitch works differently in that power to the dip beam is interrupted when the switch is in the main beam position. Current is fed directly to one of the main beam bulbs via a blue / white wire. In addition, a blue/white wire goes to the main beam relay (if fitted) which energises the other main beam via a purple / white wire.
In the dip position, current is fed to one headlight's dip filament via a blue/red wire. Again, a blue/ red wire goes to the dip relay and energises it, passing current to the other dip filament via a purple / red wire.
So what you are getting now is consistent with having no relays fitted, or they are both inoperative.
I can't quite understand why it should previously have behaved as you describe.
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Ian
2004 Tiger 955i
1955 Velocette Viper.
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Linear Mode
