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Thread: 77 connector delete question.. check this out.

  1. #1
    Senior Member Gloomshadow's Avatar
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    77 connector delete question.. check this out.


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    Senior Member Gloomshadow's Avatar
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    he checked resistance on both black wires both were "0"... hes thinking that they can hook up either way but isn't 100% sure.

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    Senior Member lancruza's Avatar
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    The two black wires coming from the regulator should have dc voltage on them when the bike is running. Output should be 14-14.4v with the bike running. You could start the bike and measure across the two black wires with a voltmeter. If you are showing positive 14 voltage then the wire with the red lead from the voltmeter would be your positive.

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    Senior Member lancruza's Avatar
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    Senior Member Gloomshadow's Avatar
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    ok thanks... this is all sorcery to me. I will show this to him and he will understand it.

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    When I was playing with the '77 connector on my '06X (ages ago I'll admit), I seem to recall the regulator shut down when it was disconnected and the resulting lack of output with the engine running caused me to chase my tail for awhile.
    What I can say for certain is that the negative black wire from the regulator output is connected directly to the case of the voltage regulator so that wire should measure 0 ohms to a good connection on the case (ie bare metal somewhere).
    I don't know what the positive wire measures to ground as far as resistance goes but can check tomorrow.
    This is a view of the internals of a 3-phase XB regulator - the wire with the yellow crimp is the negative wire and you can see it screwed to the inside of the case.

    IMG_0860.jpg

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    Senior Member lancruza's Avatar
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    Quote Originally Posted by Rays View Post
    When I was playing with the '77 connector on my '06X (ages ago I'll admit), I seem to recall the regulator shut down when it was disconnected and the resulting lack of output with the engine running caused me to chase my tail for awhile.
    What I can say for certain is that the negative black wire from the regulator output is connected directly to the case of the voltage regulator so that wire should measure 0 ohms to a good connection on the case (ie bare metal somewhere).
    I don't know what the positive wire measures to ground as far as resistance goes but can check tomorrow.
    This is a view of the internals of a 3-phase XB regulator - the wire with the yellow crimp is the negative wire and you can see it screwed to the inside of the case.

    IMG_0860.jpg
    Great info. I didn't realize that the regulator shutdown if it was not connected. Some regulators are just a passive circuit made of diodes into a bridge rectifier. The bridge rectifier is what changes the AC voltage coming out of the stator to DC voltage.

  8. #8
    Senior Member Gloomshadow's Avatar
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    Quote Originally Posted by Rays View Post
    When I was playing with the '77 connector on my '06X (ages ago I'll admit), I seem to recall the regulator shut down when it was disconnected and the resulting lack of output with the engine running caused me to chase my tail for awhile.
    What I can say for certain is that the negative black wire from the regulator output is connected directly to the case of the voltage regulator so that wire should measure 0 ohms to a good connection on the case (ie bare metal somewhere).
    I don't know what the positive wire measures to ground as far as resistance goes but can check tomorrow.
    This is a view of the internals of a 3-phase XB regulator - the wire with the yellow crimp is the negative wire and you can see it screwed to the inside of the case.

    IMG_0860.jpg
    thanks, let me know what you find so I can get this thing hooked up..

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    Ok, I grabbed a brand new 3-phase regulator from my spares box and that measures 0 ohms from the ground pin on the '77 connector to the case (I used a digital meter with auto-ranging and measured to a screw on the cable clamp on the rear of the regulator.
    This is a definite 0 ohms with the multimeter leads connected either way (ie red lead to pin + black lead to case & black lead to pin & red lead to case).

    IMG_2486.jpg

    The positive pin on the '77 connector gives infinite ohms with red lead to pin and black lead to case:

    IMG_2485.jpg

    With black lead to pin and red lead to case it looks like a capacitor is involved as it is varying (very high reading) so for this exercise look for the pin with 0 ohms both ways and you have the ground lead.
    In an earlier post you mention '0' on both leads? - if both leads read zero ohms to the case then the regulator sounds toasted but I might be misunderstanding what that refers to?
    Ray

  10. #10
    Senior Member Gloomshadow's Avatar
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    yeah both black leads came up 0 ohms.. but I'm not sure how he tested them... I will give him this info and see what he says.



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