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I've got Arduino relays, which should be fine, but have a max switching voltage of 30V. So, with what I've got, I'd have to step down the brown wire to 12V to switch the relay, then run the light from the 'LIGHT' output from the controller. That's crazy. I'll mount a switch in the handlebar.

Ah, okay. I've got the SW900. The reason for citing the others is that the 'manual' pages and wording are identical for the Sxxx LCDs that I've seen, and the boards look very similar, so I wanted to emphasise the prevalence of the issue. I've searched for an answer, obviously, and only found one...

It's got it's own transistor. It's the same basic circuit as the S866. If I may ask, what applications have you encountered that used the brown wire, and what was the wiring?

Thanks...that makes a lot of sense. I appreciate your efforts with this - very impressive. Just to be clear, I haven't yet connected anything to the LCD brown/white wires, which still switch as they should with the LCD backlight control. The controller was brand new when I metered the 'LIGHTS'...

Forgive me, but I don't think you've understood what I've said. If you look at the page from the manual (included in my post), it says that some controllers can switch the lights connector under software instruction from the LCD, but some can not. It might help if I ask a specific question: How...

Thanks, but no, it's not that. It did the same when the light was initially connected directly (it's good up to 60 V - I just want 12 V going around to the lights, and then 5 V for USB charging of the alarm and the GPS). Also, the power display on the SW900 is all over the place. It shows 2-300...

HI all, Apologies if this is dealt with elsewhere. After replacing a failed controller (with one that was promised to be SW900-compatible, but really isn't), I decided to wire in the lights to the (battery voltage) 'lights' output of the controller, through a 48V->12V DC-DC converter...