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Alternator or Electrics?

  • 19-09-2013 1:31pm
    #1
    death1234567
    Registered Users, Registered Users 2 Posts: 3,335 ✭✭✭


    Hi,

    I have ~12V battery in my bike and I took the bike out for a ~15mile rounds spin last week. Then when I went to start it 7 days later the battery didn't have enough juice to turn the starter over. It was close but just not enough. I hooked it up to my battery charger and there's 6-9V left in it.

    The question is what's causing the battery to drain so fast? I have an alarm on the bike alright and it's kept outside but 7 days seems like a very short time for the electrics to drain 3 - 6 volts. Could it be that my alternator isn't charging the battery?

    Thanks,


Comments

  • #2
    Wossack
    Registered Users, Registered Users 2 Posts: 7,025 ✭✭✭Wossack


    battery is knackered and cant hold a charge, imo


  • #3
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,180 ✭✭✭✭jimgoose


    If that battery is only showing near 6v then it's Donald Ducked. Replace it, and put a multimeter across the terminals while the bike is running to verify that at least the charging voltage is correct. It should show in the region of 14.6v as you blip the throttle.


  • #4
    nerrad1983
    Registered Users Posts: 502 ✭✭✭nerrad1983


    I was told a very easy way to check your regulator by lookbehindyou off this forum

    1: Start your bike up and turn on full beam lights
    2: Rev up the motorbike, if the light gets brighter the regulator is ok, if it gets dimmer as you are revving the bike the regulator is not working properly as the battery is not being charged

    Handy way to find out if that is causing your problem


  • #5
    death1234567
    Registered Users, Registered Users 2 Posts: 3,335 ✭✭✭death1234567


    Wossack wrote: »
    battery is knackered and cant hold a charge, imo
    Definietely not this as it's a brand new battery that charges fine on an external charger.

    Thanks for the other advice. I'll check the regulator later.


  • #6
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    death1234567 wrote: »
    Definietely not this as it's a brand new battery that charges fine on an external charger.

    Thanks for the other advice. I'll check the regulator later.
    Charge the battery fully, fit it and see what it reads under load. (while starting)
    New batteries have been known to fail.
    Don't rule the battery out until you know its good and holds a charge for a decent time.


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