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  1. #1

    Member #
    12357
    Bike(s)
    1997 Blackbird CBR1100XX
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    Sep 13 2011
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    Texas
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    I think its the DIODE

    Just replaced the Cam Chain Tensioner Lifter with the mechanical version and all went well. Cranked up, ran for about 30 minutes sitting in garage revved up fine sounded perfect. Due to weather and coming down with the flue, my Bird sat for about a week. Went to check out last night so I could ride to work today and this is what happened. Turned switch on, turned choke on, turned ignition on. Headlight came on, all dash lights came on. Hit the start switch, heard a click & everything died but the clock. Checked battery voltage & ground all ok. Checked ignition switch & starter switch both ok. Checked all fuses including the big one on the start solenoid, ok. Was putting ignition wiring harness back together & all lights came back on. Tried start switch again and the same thing happened, all dead but clock. Click sound before all lights out was coming from battery compartment area where the fuse box, relays and start solenoid are all located. Waited a few minutes and all lights came back on without touching anything. Tried start switch and focused attention on the battery compartment area. Started touching components, relays, fuse box, starter solenoid as I hit the start switch to try and pin point clicking sound. It was the fuse box. I double checked all fuses with a meter, even though I now fuses only make a sound maybe when they blow. Checked the manual and found out there is a diode in the fuse box. I have no idea what a diode does. I pulled the diode from the fuse box, all light were off, when I went to reinstall the diode, as soon as I touch the 3 prongs to the there contact points, all lights came back on, I did not insert the diode, it was still in my hand & the lights all stayed on. I then went ahead and inserted the diode completely, the lights stayed on, tried the start switch, the diode clicked and everything went out. My question is: does a diode work like a capacitor? Do they go bad? Am I totally off the mark? Any help would be greatly appreciated.

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  3. #2
    Resident Eh?hole.
    Member #
    4791
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    Silver '02 XX
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    Re: I think its the DIODE

    The diode is part of the start safety circuit. This circuit ensures that the engine will not start unless either the engine is in neutral or the clutch is disengaged. It also ensures the engine will not run if a gear is selected while the side stand is deployed, regardless of the state of clutch engagement or disengagement. Think of the diode as a one-way gate that allows current to flow in only one direction. It ties different parts of the ssc together and acts like a traffic cop. I doubt it is the source of your problem.

    First thing you should do is load test the battery, the symptoms seem to point to it.
    Where are we going...and what am I doing in this hand basket??

  4. #3
    Supercharged Mod
    Member #
    4781
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    99 Bird standardish. 03 Supercharged KwakBird
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    Oct 25 2008
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    UK South West
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    Re: I think its the DIODE

    Agree with Shewie, I note
    ran for about 30 minutes sitting in garage revved up fine
    my Bird sat for about a week
    If it wasn't revved up much 30 minutes of running at idle will drain the battery especially if your headlight is drawing current and the fan turns on. Add to that a week if idleness with natural drains (clock and wiring) and whilst you state
    Checked battery voltage & ground all ok
    what was the voltage and how old is the battery?
    Full of Hot air? Intercool yourself............ you know it makes sense

  5. #4

    Member #
    12357
    Bike(s)
    1997 Blackbird CBR1100XX
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    Re: I think its the DIODE

    Battery showed 12.75 VDC. If it was the side stand or other component in the ssc, would it knock out all the lights and after a few minutes come back on all by itself?

  6. #5
    Resident Eh?hole.
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    Re: I think its the DIODE

    Quote Originally Posted by new2street View Post
    Battery showed 12.75 VDC. If it was the side stand or other component in the ssc, would it knock out all the lights and after a few minutes come back on all by itself?
    No, they are completely separate circuits. What can cause this is a battery with one or more failing cells. It will have good voltage across it until it is loaded, whereupon the voltage will fall off dramatically. Try measuring the battery voltage while you press the start button (an analogue meter is helpful here) and see if it drops significantly. Also, try wiggling the ignition to ensure the contacts are not failing - ridiculously, all power in the bike, save for the clock and starter, runs through those contacts.
    Where are we going...and what am I doing in this hand basket??

  7. #6

    Member #
    12357
    Bike(s)
    1997 Blackbird CBR1100XX
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    Re: I think its the DIODE

    I will check battery and see. Thanks for the help.

  8. #7

    Member #
    12357
    Bike(s)
    1997 Blackbird CBR1100XX
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    Re: I think its the DIODE

    To Shewie & Theduck. A Big Thank You from Texas. Battery dropping off to nothing when ignition switch turned on. New battery and everything working, starting perfectly. Thanks again for the advise & steering me in the right direction.

  9. #8
    Resident Eh?hole.
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    Re: I think its the DIODE

    Great news. Now go put some miles on that thing.
    Where are we going...and what am I doing in this hand basket??

  10. #9
    Supercharged Mod
    Member #
    4781
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    99 Bird standardish. 03 Supercharged KwakBird
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    Re: I think its the DIODE

    Glad you are sorted
    Full of Hot air? Intercool yourself............ you know it makes sense


 

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