Author Auxiliary Power Supply  (Read 2540 times)

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  • Offline Stevo1966   gb

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    Offline Stevo1966

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    Auxiliary Power Supply
    on: February 24, 2021, 10:16:34 am
    February 24, 2021, 10:16:34 am
    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.

  • Offline Anchorman   gb

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    Offline Anchorman

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    Re: Auxiliary Power Supply
    Reply #1 on: February 24, 2021, 10:46:46 am
    February 24, 2021, 10:46:46 am
    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

  • Offline Stevo1966   gb

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    Offline Stevo1966

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    Re: Auxiliary Power Supply
    Reply #2 on: February 24, 2021, 11:20:51 am
    February 24, 2021, 11:20:51 am
    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

  • Offline Anchorman   gb

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    Offline Anchorman

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    Re: Auxiliary Power Supply
    Reply #3 on: February 24, 2021, 11:47:44 am
    February 24, 2021, 11:47:44 am
    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

  • Offline Salem   nl

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    Offline Salem

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    Re: Auxiliary Power Supply
    Reply #4 on: February 24, 2021, 12:50:35 pm
    February 24, 2021, 12:50:35 pm
    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.. :001:

  • Offline Stevo1966   gb

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    Offline Stevo1966

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    Re: Auxiliary Power Supply
    Reply #5 on: February 24, 2021, 05:11:44 pm
    February 24, 2021, 05:11:44 pm
    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 👍🏻

  • Online the bartender   ca

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    Online the bartender

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    Re: Auxiliary Power Supply
    Reply #6 on: February 24, 2021, 07:58:38 pm
    February 24, 2021, 07:58:38 pm
    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.

  • Offline Stevo1966   gb

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    Offline Stevo1966

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    Re: Auxiliary Power Supply
    Reply #7 on: February 25, 2021, 06:23:18 pm
    February 25, 2021, 06:23:18 pm
    Bartender: I did as you suggested and you're correct, probably nearer 4/5 mins but it does switch off, thanks for your suggestion 👍🏻

  • Offline ch2004   scotland

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    Offline ch2004

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    Re: Auxiliary Power Supply
    Reply #8 on: February 26, 2021, 07:57:47 pm
    February 26, 2021, 07:57:47 pm
    *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.

  • Offline Stevo1966   gb

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    Offline Stevo1966

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    Re: Auxiliary Power Supply
    Reply #9 on: March 01, 2021, 10:44:30 am
    March 01, 2021, 10:44:30 am
    Installed the relay, now turns off after 60 seconds. Thanks for your advice 👍🏻

     



    dysfunctional