765 Battery Kaput, Repeatedly

Discussion in 'Street Triple' started by ContactSC, Mar 25, 2019.

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  1. ContactSC

    ContactSC Well-Known Member

    Sep 7, 2018
    55
    68
    Nottingham, UK
    I have a Street Triple 765 and I keep finding the battery is dead. Occasionally, this is my fault, leaving the ignition switch on the handlebar (not the key) in the 'down' position, and is nothing the Oxford Oximiser can't put right, given time. But this AM for instance, it starts fine, I turn it off, go inside to put on the gear for less than 10 mins, come out and it's dead. I don't get it - does the battery drain that quickly if you leave the ignition switch on? I'm sure it's my fault there too, just want guidance.

    Is anyone else experiencing this with their 765?
     
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  2. ineale

    ineale New Member

    Sep 19, 2018
    9
    3
    England
    When you say 'dead' I take it you mean the dash doesn't come alive and there's no indication of any power at all. If this is happening just after it's been running then I'd say it's not your battery but most likely a wiring fault.

    I'd definitely be taking it back to the dealer whilst it's under warranty!!!!
     
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  3. ContactSC

    ContactSC Well-Known Member

    Sep 7, 2018
    55
    68
    Nottingham, UK
    Thanks for this and sorry for the missing info - no, the dash comes on, it just doesn't turn over. Pretty sure it's the battery, but just wondering why it keeps happening.
     
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  4. Eldon

    Eldon Elite Member

    Nov 14, 2018
    4,178
    800
    North Yorkshire
    I have a 765 and don't have these issues.
    Do you have a voltmeter?
    A quick check before cranking and after would soon give you a good indicator of the state of the battery. As others have said I don't think this is an internal battery fault; possibly a starter relay issue.
     
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  5. ContactSC

    ContactSC Well-Known Member

    Sep 7, 2018
    55
    68
    Nottingham, UK
    Thanks, yes I do so will try that first!
     
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  6. Eldon

    Eldon Elite Member

    Nov 14, 2018
    4,178
    800
    North Yorkshire
    Post up your numbers.
    Connect voltmeter before switching on = ww volts
    Key switched on = xx volts
    Cranking = yy volts
    Running = zz volts
     
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  7. stinger

    stinger Senior Member

    Nov 28, 2017
    730
    243
    Yarnbrook
    If the battery has been fully discharged several times it is most likely now not holding charge.
     
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  8. joe mc donald

    Subscriber

    Dec 26, 2014
    13,920
    1,000
    slough / burnham
    ContactSC.
    Get it back to the dealer. The bike is not right and while you have warranty let them sort it.
    Ride Safe
    Joe.
     
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  9. ContactSC

    ContactSC Well-Known Member

    Sep 7, 2018
    55
    68
    Nottingham, UK
    So, before switching on = 11.72V.
    Key on - starts at 10V but then continually drops, 0.1 per second
    Does not crank or start.

    So I think @stinger was probably right too. Bought a brand new battery and it seems to be working (but have also bought one of those powerbank jump starters too, which I'll keep with me!)
     
  10. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,358
    800
    Nr Biggar
    Check the voltage between terminals engine running. About 13 volts at tickover and 14ish blipped throttle. It confirms your charging circuit is healthy and that the problem was purely use/battery related.
     
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  11. ContactSC

    ContactSC Well-Known Member

    Sep 7, 2018
    55
    68
    Nottingham, UK
    Thank you that's very useful, I'll do that!
     
  12. Eldon

    Eldon Elite Member

    Nov 14, 2018
    4,178
    800
    North Yorkshire
    #12 Eldon, Apr 1, 2019
    Last edited: Apr 1, 2019
    At those voltages mate you are quite a way off before you start.
    A battery is a collection of cells normally six each giving 2.2 volts so fully charged in good condition you should be looking around 13 volts.
    Around 11 volts bare minimum when cranking is required for the injection and other demands.
    Confirm charging when running as pointed out is around 14 volts and all should be good to go.
     
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