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Thread: Charging system trouble (Regulator/rectifier 1988 Vmax)

  1. #1
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    Charging system trouble (Regulator/rectifier 1988 Vmax)

    Ok, been having trouble with the Max keeping the battery charged. Been going through the steps as per help from a few of the local members of KB, Vmax forum and my service manual but now I'm stuck again.

    I've checked the Stator coild resistance and that was sweet, next step was the Regulator/Rectifier. Have it off the bike now but it's a sealed unit and from what I can understand of the manual I'm supposed to test alot of things inside of it . I've added a screen shot of the relevant page.

    Thought of testing the wires comming out of it but the only time I get a reading is one pin from the mutlimeter on the metal casing and the other on the one flat pin inside the plug with the white wires.
    Only other wire comming out is a red one wich I'm assuming is the power line to the battery.
    Can anybody help?

    Manual page is here.

    Sever
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  2. #2
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    Bump ump, Anyone at all? This is seriously keeping me up at night trying to fix it nd that's starting to affectme at work and I need to work my ass off every day for the next few weeks to be able to afford some things I want to do, like trackdays.

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  3. #3
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    Cool

    Gee I didnt think your new bike was a 1988 model.
    I thought it was a much later model....

    Good luck in fixing the problem.....

  4. #4
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    Compare it to any later model Max and you won't find much diference. Except rims and rotors.

    Sever
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    see her, you'll never free her
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  5. #5
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    To use that diagram you need to open up the rectifier and get at all the diodes and check individualy. Set your multimeter to diode mode if it has one, continuity/resistance check won't show much. Easier to check the AC output from your generator to the rectifier then see if you have a DC output from the recitifier to your battery.
    I love the smell of twin V16's in the morning..

  6. #6
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    Ok, how do I get the thing open with out ruining it? Or how do I check the other things?

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  7. #7
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    Its probably sealed and potted with epoxy or similar - if your'e feeling brave get a sharp knife and cut around the seal if there is one. You wanna be sure its faulty before you hack it open. By the looks of it you should have a decent amount of ac volts from your generator between 1 and 3, 1 and 2, 2 and 3. - So you should record three readings across these white wires - check this first.
    I love the smell of twin V16's in the morning..

  8. #8
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    use your meter on resistance / ohms

    If digital then just read the values, if a needle meter then you will need to use a lowish setting.

    Way over simplifyling things - the device, has diodes in it (d1 thru d6) which only flow current in one direction. So it takes the 3 inputs from the 1, 2, 3 leads from the generation source, which is putting out alternating (positve and negative) current. The regulator part limits the voltage so that it doesnt get too high.

    Touch the meter probes together and you will see what a short looks like.

    Simplistically again....

    Put the red + meter lead on wire 1 and the black on 4. This sounds like there isn't a black wire 4 and this is earthed in the device ie the metal case (keep your big fingers off the metal parts).

    Note the meter response. Now swap the leads around and you should get a significantly different meter response. Have a look at the table, this is the "x" and "o" stuff for a pocket tester or continuity tester.

    Do the same between lead 1 and the red lead 5 and do the swap thing again.

    Do likewise for lead 2 and the case and the red lead 5.

    Do like wise for lead 3.

    If you get measures that are match the table then it is PROBABLY OK.

    Remember that your meter prolly has a 1.5v battery and your bike is 12v, and as you ride everything is vibrating, shaking and wallowing (Vmax!)

    EDIT: what is the voltage across the battery with the motor running?
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  9. #9
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    Did what paturoa said and only got a readin on one of the wires as I said earlier and the metal case. which was 30.9 no mater wich poket meter pin was where. All other wires gave me nothing.

    Sever
    Now and forever
    you're just another lost soul about to be mine again
    see her, you'll never free her
    you must surrender it all
    And give life to me again
    Disturbed - Inside the Fire


  10. #10
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    Quote Originally Posted by paturoa View Post
    EDIT: what is the voltage across the battery with the motor running?
    12 something and remains that way no matter how high I rev the bike.

    Sever
    Now and forever
    you're just another lost soul about to be mine again
    see her, you'll never free her
    you must surrender it all
    And give life to me again
    Disturbed - Inside the Fire


  11. #11
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    If you're generators not generating AC then the rectifier has nothing to rectify to DC- you need to check those three white wires for AC voltage.
    I love the smell of twin V16's in the morning..

  12. #12
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    Here's something that may help you out (the pdf download):

    http://www.electrosport.com/electros...t_finding.html

  13. #13
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    Quote Originally Posted by jonbuoy View Post
    If you're generators not generating AC then the rectifier has nothing to rectify to DC- you need to check those three white wires for AC voltage.
    The ones comming from the stator coil?

    I really hate not knowing much about this shit....

    Sever
    Now and forever
    you're just another lost soul about to be mine again
    see her, you'll never free her
    you must surrender it all
    And give life to me again
    Disturbed - Inside the Fire


  14. #14
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    Quote Originally Posted by Waylander View Post
    The ones comming from the stator coil?

    I really hate not knowing much about this shit....
    Those are the ones, this might help - different bike but similar system:

    http://www.kiwibiker.co.nz/forums/sh...ad.php?t=24377
    I love the smell of twin V16's in the morning..

  15. #15
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    Quote Originally Posted by jonbuoy View Post
    Those are the ones, this might help - different bike but similar system:

    http://www.kiwibiker.co.nz/forums/sh...ad.php?t=24377
    Manual had me check the resistance through those wires earlier, came up fin.

    Does your test need the bike to be running?

    Sever
    Now and forever
    you're just another lost soul about to be mine again
    see her, you'll never free her
    you must surrender it all
    And give life to me again
    Disturbed - Inside the Fire


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