Help please! - BMW F800 Riders Forum & Registry



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  1. #1
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    Hi, I'll start off by saying I'm an idiot for messing with my bike but if you can help I would appreciate it... Basically i bought a noco g750 charger for a previous bike a while ago. Recently I bought the din charger attachment and charged my 2016 bmw gs800 through the DIN socket. A couple weeks later I go back to plug in the DIN charger and notice that the pins that grip the attachment within the din socket look a little wide so I think to myself 'i'll grab a screw and try and push them together to make the din charger accessory fit a bit better' however when I did this I must have touched the - and + parts of the din socket together because there was a spark and now no power at all when ignition turned on.... Battery is full (I checked). I rang BMW and the bloke suggested a fuse may have gone but he couldn't remember which one it would be and where it is... Please can u help?

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  3. #2
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    Are we speaking here of the OEM socket or an aftermarket socket wired to the battery?

    If it's the former then there is no fuse as the port is controlled by a control module known as the ZFE. In theory the ZFE should have shut down the port when you shorted it out and it should reset when the ignition is recycled. If recycling the ignition does not work then I would suggest seeking out someone with a GS-911 or the Motoscan app to check for a fault code and do a reset.

    If it is the latter then indeed a fuse should have been placed in line with the wiring and it would have blown when you shorted out the port. You would have to trace the wire to find the in-line fuse holder.

    And yes you are an idiot for sticking a piece of metal into a socket when it is live.

    Also if the socket is OEM you cannot charge the battery through it unless the charger is a BMW charger or some other that can do the "CANbus" (a misnomer) handshake with the ZFE.

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  5. #3
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    Perhaps simply disconnecting the battery waiting for 30 seconds and reconnecting it is a good first step?

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  8. #4
    notacop is offline The original Schwartz Wald Troll
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    I did the same thing using a broken BMW plug in the socket on my G650GS. It actually has fuses though. The 800 series has Can Bus and no fuses as such.
    You may try that suggestion of disconnecting the negative batt terminal for a while.

  9. #5
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    Welcome to the "F"orum.
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  10. #6
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    How did you find out that there is no power? Maybe you created a permanent short?

    /Guenther

  11. #7
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    Thanks guys. Absolutely kicking myself and praying it's not mega expensive

  12. #8
    guenner's Avatar
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    Quote Originally Posted by Bigfishcake View Post
    Thanks guys. Absolutely kicking myself and praying it's not mega expensive
    no power at all when ignition turned on
    - just for the socket or the whole bike?

    Maybe some answers to questions that have been posted?

    /Guenther

  13. #9
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    No power at all to the bike not just the socket. It's not an aftermarket part I was using a noco din charger which was charging the bike through the din socket absolutely fine

  14. #10
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    There is a fuse off the din socket which is a 30amp I think I will try and replace

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    guenner's Avatar
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    There is a fuse off the din socket which is a 30amp I think I will try and replace
    This fuse is NOT exclusively for the utility socket!!!

    This 30amp fuse is the ONLY old style mechanical fuse on the bike. It is the 'last chance' fuse for the wire that goes from the bike's COMBINED electric to the battery. If that is blown...WOW! Well, check it out. It is visible in a holder near the battery.

    /Guenther

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  18. #12
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    Quote Originally Posted by guenner View Post
    This fuse is NOT exclusively for the utility socket!!!

    This 30amp fuse is the ONLY old style mechanical fuse on the bike. It is the 'last chance' fuse for the wire that goes from the bike's COMBINED electric to the battery. If that is blown...WOW! Well, check it out. It is visible in a holder near the battery.

    /Guenther
    Wow this is the first that I have heard of an old style fuse. I've never seen it despite almost 10 years of working on these bikes. I can't see a fuse in the schematics either. Can you elaborate please? Location? Photo?

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  20. #13
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    From my 2017 F700GS owners manual:

    Click image for larger version. 

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    (1) points to the holder of the fuse on top of the battery. A final electronic fuse might not work if your electronic is already kaput.

    /Guenther

  21. #14
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    Don't know about other people, but my '13 800GS does not have that fuse.

  22. #15
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    Maybe there is a "fusable link"? Looks like a wire, but actually a fuse meant to burn out. Sometimes used as kind of a last ditch fuse.

  23. #16
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    Quote Originally Posted by guenner View Post
    From my 2017 F700GS owners manual:

    Click image for larger version. 

Name:	Fuse F700GS.jpg 
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    (1) points to the holder of the fuse on top of the battery. A final electronic fuse might not work if your electronic is already kaput.

    /Guenther
    Thanks for that. I see in the manual that it makes reference to the voltage regulator. Any chance that you can elaborate on the connection? Older bikes have the wiring shown here (i.e. no fuse). Can you tell how your bike differs?
    Click image for larger version. 

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    This is clearly something that was introduced in later model years. Perhaps those reading this thread could comment on the year of their bike if they also have this fuse as it it would be good to know when the change was made.

  24. #17
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    Mine was build in 10/2016. I have not seen an official document about what has changed for which year for F700/F800 models. But looking at parts lists it seems there were changes between between 2012/2013 and 2015/2016. I have not looked for F800GSes.

    I can only guess after a couple of reports with the charging system producing voltages over ~14 damaging the alternator they put a fuse in.

    Mine is build number 0B16. Even the latest electrical diagram I have for a 2016 model does not show the fuse(?).

    /Guenther
    Last edited by guenner; 02-12-20 at 06:43 PM.

  25. #18
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    In looking at the F800GS schematic posted on F800riders.org, it appears that you could test for battery voltage at pins 1,3, and 29 of the Central Chassis Control Unit harness. If you don't have battery voltage there with the harness unplugged, I would bet that your Control Unit is fine. There would have to be a fuse or similar opened upstream. Good luck to you. It's never as bad as it seems, unless you own a Ducati

  26. #19
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    Update - I just went out and swapped the 30amp fuse and hey presto it worked! That has saved me a bundle of £££s. Thanks for all your assistance chaps

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  28. #20
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    Which begs the question why didn't the ZFE intervene when the outlet was shorted? Why did a short at the outlet blow a main fuse?

  29. #21
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    Without knowing exactly what Bigfishcake did, I have no clue. With ignition off for over a minute there should have been no 12V at the utility connector. So, was the utility connector still powered on? Did it cause a spark when he bent the contacts with the screwdriver?

    I agree, the ZFE should have shut down the utility connector for OUTPUT because of the short. Not sure what the ZFE does when it sees the charging voltage at the connector from a charger. Is the charger certified to charge through the utility connector?

    Maybe Bigfishcake did something else in the area to cause the fuse to blow?

    I am glad to hear that the bike is running again.

    /Guenther

  30. #22
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    I think that the ignition must have been on and I didn't notice tbh. Daft bugger. There was a spark when I touched the contacts

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