Results 1 to 7 of 7

Thread: '87 K75s Dead Battery Or?

  1. #1
    Registered User kentuvman's Avatar
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Posts
    870

    '87 K75s Dead Battery Or?

    Hi Gang,

    Have not had the K75s out since May - went to put on battery tender this morning and normally the red light comes on before I connect to power - this time it did not - turned ignition switch and dead - no power.

    Connected 12V battery charger on positive terminal by taking off one side cover and grounded to frame. Battery almost indicates charged - turned on key and the tach rocketed up - strange. Clock did come on as did the other normal indicator lights when switched on. Was also on the 2 amp slow charge setting on charger.

    Put a voltmeter to + terminal and grounded other side to frame & getting less than 1.5 volts.

    Battery on bike is a Westco sealed 12V20P
    Bought @ March 2010.

    Normally when charger connected, I hear the humming from the charger - I'm hearing a slight humming noise somewhere near the battery on the bike.

    So, right now in PAUSE mode - charger not connected to bike.

    Guessing bad battery but wondering why tach needle shot up when I turned on ignition switch with battery charger on the lowest setting.

    Thanks for your help in advance & Happy & Safe July 4th weekend holiday!
    Ken Tuvman
    Excelsior, MN
    K75s, R65LS, R60/5

  2. #2
    3 Red Bricks
    Join Date
    Jan 2007
    Location
    Pleasanton, Ca.
    Posts
    3,344
    Put voltmeter directly on both battery terminals (not on the wires or bolts connected to terminals). If you still get 1.5 volts, the battery is the problem. If you get much higher, the connections are the problem.

    Most battery chargers will not show charging when first connected to a battery that is completely discharged. Some times it will take many hours at around 10 amps to even start showing a charge on the charger's meter.

    If the voltmeter shows that the battery is the problem, I would remove the battery before trying to charge it. Batteries can have a nasty tendency to do bad things (like explode) when something is internally wrong and high current is being applied to them. Better safe than sorry.



    Last edited by 98lee; 07-04-2013 at 05:54 PM.
    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  3. #3
    Registered User kentuvman's Avatar
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Posts
    870
    Quote Originally Posted by 98lee View Post
    Put voltmeter directly on both battery terminals (not on the wires or bolts connected to terminals). If you still get 1.5 volts, the battery is the problem. If you get much higher, the connections are the problem.

    Most battery chargers will not show charging when first connected to a battery that is completely discharged. Some times it will take many hours at around 10 amps to even start showing a charge on the chargers meter.

    If the voltmeter shows that the battery is the problem, I would remove the battery before trying to charge it. Batteries can have a nasty tendency to do bad things (like explode) when something is internally wrong and high current is being applied to them. Better safe than sorry.



    Thanks, Lee - did remove both side covers - current is 1.5 - will replace!!! (cheap insurance)
    Ken Tuvman
    Excelsior, MN
    K75s, R65LS, R60/5

  4. #4
    rsbeemer 22600's Avatar
    Join Date
    Jan 2011
    Location
    New Braunfels,Texas/Taichung, Taiwan
    Posts
    337

    I had similiar problem

    I had similar problem on my old k75s (smoothest bike I ever owned) and if tapped on top on the starter relay (under the seat), it would fix the problem. Easy and inexpensive thing to try.

    DW
    1978 R100rs MOA#22600 125cc Kymco
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.

  5. #5
    Rally Rat
    Join Date
    Jun 2012
    Location
    Olympia, WA
    Posts
    170
    Quote Originally Posted by 22600 View Post
    ... if tapped on top on the starter relay (under the seat), it would fix the problem.
    If your starter relay was sticking it was probably because your battery was low. You temporarily fixed a symptom, not the problem.

  6. #6
    Registered User kentuvman's Avatar
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Posts
    870
    I replaced the battery with a comparable battery from Fleet Farm - and I'm good.

    The Westco I replaced surprised me. It was dead as a doornail and wouldn't take a charge. I've heard of sealed batteries going quick but now I've seen it with my own eyes.
    Ken Tuvman
    Excelsior, MN
    K75s, R65LS, R60/5

  7. #7
    rsbeemer 22600's Avatar
    Join Date
    Jan 2011
    Location
    New Braunfels,Texas/Taichung, Taiwan
    Posts
    337

    You're right

    Quote Originally Posted by timtyler View Post
    If your starter relay was sticking it was probably because your battery was low. You temporarily fixed a symptom, not the problem.
    As I can faintly remember, I did change that old battery out shortly after that episode. But, I well remember that when it happened I was about 3000 miles away from home in a little town on hwy 191 between Yellow Stone and Four Corners, Montana. And, when I beat on the top of that relay, it sure fixed my problem at the time.

    DW
    1978 R100rs MOA#22600 125cc Kymco
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •