Yellow, Pink and White? Yeah, right! 1970 CB450
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Thread: Yellow, Pink and White? Yeah, right! 1970 CB450

  1. #1
    Junior Member ts354's Avatar
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    Yellow, Pink and White? Yeah, right! 1970 CB450

    1970 CB450 Pre-color apparently, See kids, things in the 70's did always look orange and brown just like your grandparents pictures!


    I'm having some charging issues, or, lack there of....
    Confused as to what is supposed to be what here. Can we tell by the routing through the plug that goes between the cover and block, i.e., top, middle, and bottom? Does anyone have a '70 model that can confirm these colors?Yellow, Pink and White?  Yeah, right!  1970 CB450-wshoplght.jpgYellow, Pink and White?  Yeah, right!  1970 CB450-cameraflash.jpg

  2. #2
    Senior Member 76TWIN's Avatar
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    First thing first, do you have the Honda FSM? If not then you should download one from here.
    https://docs.google.com/file/d/0B_Zu...t?ddrp=1&hl=en


    Secondly the charging issue is most likely your regulator and rectifier have crapped out. Have a read
    https://www.hondatwins.net/forums/50...r-upgrade.html
    https://www.hondatwins.net/forums/57...-charging.html
    '76 CB500T Frankenbike
    '73 CL450 (basket case for now)


    Carpe narem.

  3. #3
    Junior Member ts354's Avatar
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    Whoops, should have said I installed one of these. 12V Single Phase Regulator/Rectifier - Sparck Moto

    Yellow, Pink and White?  Yeah, right!  1970 CB450-fsm-colors.jpg
    This helps some, but which wire is Yellow and which wire is Pink in my pictures? They both look off white to yellow.
    Just trying to confirm I have the colors/wires correct.

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  5. #4
    Senior Member 76TWIN's Avatar
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    Looks to me like

    Yellow, Pink and White?  Yeah, right!  1970 CB450-generator.jpg


    But if you really want to be certain read the below

    https://www.hondatwins.net/forums/57...colours-3.html
    Last edited by 76TWIN; 04-11-2019 at 09:46 PM.
    '76 CB500T Frankenbike
    '73 CL450 (basket case for now)


    Carpe narem.

  6. #5
    Sensei 66Sprint's Avatar
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    Unplug the alternator from the main harness....
    Set meter to AC volts in the lowest range that can handle 50VAC.....Probably the 200 range.... Label the wires #1, #2, #3
    Read AC output between all three possible pairs of wires with engine idling.....(#1-#2), (#1-#3), and (#2-#3) and write down results......
    LOWEST output will be between White and Yellow, (regardless of the color they now appear to be)...
    Connect them together and to an AC terminal of the rectifier,(usually the Yellow wire one)...
    The wire that is COMMON to both higher readings is the Pink wire...Connect it to the other AC terminal of the rectifier, (Usually the Pink one).....
    Rectifier Green goes to ground and/or battery negative....
    Rectifier Red (or Red with White stripe) goes to battery positive.......
    Last edited by 66Sprint; 04-11-2019 at 10:09 PM.
    540nova likes this.
    "I have a mind like a steel trap.....Old and rusty, of antiquated design, and hard to get stuff back out of...."

  7. #6
    Junior Member ts354's Avatar
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    Okay, unplugged the alternator from the harness. I numbered the three wires coming out of the alternator 1,2 and 3. The green colored wire got named the #2 wire and the other two are #1 and #3.
    #1 & #2 =~ 18.5v
    #1 & #3 =~ 20.5v
    #2 & #3 = .4v

    Is this a problem that #2 & #3 read only .4v? Or is that correct?
    Just want to check before moving on.
    Thanks!

  8. #7
    Sensei 66Sprint's Avatar
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    It's normal, and fine... #1 is the Pink wire and connects to rect/reg Pink...
    Connect #2 &#3 together and to rectifier/regulator Yellow
    Rect Red or red with white stripe to battery positive....
    Rect Green to ground and or Battery negative
    Sparkmoto rect/reg also has a black voltage sensing wire, so connect it to the black female connector that used to go to the Honda regulator (in the three wire cluster with a yellow and a green) Yellow and Green are now unused, but should be taped off....
    Re-charging system complete.....
    Last edited by 66Sprint; 04-12-2019 at 05:22 PM.
    "I have a mind like a steel trap.....Old and rusty, of antiquated design, and hard to get stuff back out of...."

  9. #8
    Junior Member ts354's Avatar
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    Oh Hell Yeah! 66Sprint gets a big ole' Tom Hanks!!!!

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