When the brake light turns on, the headlight shuts off, wtf?

Jo C. /
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Hi guys,

So as the title says, when my Peugeot's brake light is on, the headlight shuts off. Otherwise everything seems fine, though the lights are a bit dimmer than I'd like while the bike is idling. Also, the brake light doesn't work when the bike is at low RPM's (basically idling).

Electrical work is not exactly my forte, so any help is appreciated.

I'm wondering if this may be a grounding problem with the handlebar controls.

I've attached a wiring schematic I've made for my bike. Most of the harness is NOS peugeot, just modified for a cdi.

Thx a ton!!

103 DUCATI WIRING (1).jpg
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