Auxiliary Power Supply

[Stevo1966]

I've connected auxiliary lights to the unused connection under the seat via a proper 2 wire connector. All works as expected with no errors, however when turning off the ignition the lights remain on permanently until I disconnect the power, I was expecting them to turn off with the usual time delay. Has anyone any idea why ? thanks.

[Anchorman]

I have heard that when fitting accessories to the BMW Cambus system, it is sometimes necessary to have the dealer re-program and wonder if this is your issue

[Stevo1966]

Maybe.
I have a usb charger with a voltage meter on the same circuit which turns off as expected, but only when the lights are disconnected, I'm thinking it might be a current draw issue

[Anchorman]

I believe that the can bus system will only draw a maximum of 5 amps but I would have thought that overloading the system would trip the system rather than allowing a higher output. Does the usb turn off after a short period with the ignition if the lights are not connected, if so, it sounds like too much current draw as you state

[Salem]

did you use a relay for the lights, and is that wired correctly?  Sounds like the 12V out of the relay (30)  is also connected to the switched input (86), if so it will switch on but not off..

[Stevo1966]

Anchorman : yes usb turns off when lights are disconnected
Salem: didn't use a relay, hoped it would be ok without. A relay was my next thought.
Thanks for your input guys 👍🏻

[the bartender]

there are circuits that will keep power live for a set time after you've turned the bike off. I would try letting it sit for 2-3 minutes to see if they turn off after time.

[Stevo1966]

Bartender: I did as you suggested and you're correct, probably nearer 4/5 mins but it does switch off, thanks for your suggestion 👍🏻

[ch2004]

Originally Posted by Stevo1966

Bartender: I did as you suggested and you're correct, probably nearer 4/5 mins but it does switch off, thanks for your suggestion 👍🏻

It sounds like the current draw is keeping the canbus awake. I had the same problem and used a relay and the spots switched off with the lights.

I used the rear power connector for my spots and wired a small pushbutton to the relay on my '16XR. I attached the switch to the BMW bracket that sits just under the seat, on the frame, on the LHS.
That way I have an on/off option for the spots discreetly hidden.

[Stevo1966]

Installed the relay, now turns off after 60 seconds. Thanks for your advice 👍🏻