Wiring Digital Speedometer
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  1. #1
    Member arieon69's Avatar
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    Wiring Digital Speedometer

    I recently bought a new speedo for my 81 CM400T. A digital one from Amazon, but it is also an eBay product... Chinese made. I won't say its a piece of crap because I haven't used it yet. I need some help with wiring. I thought I had it right, but it didn't power on. So I figured I'd post here, maybe someone has done it before with the same one and can share their wire pairing. Here's a picture of the Speedo as well as a pic of the wiring info. The 9 Pin is the plug that I'm using mostly. The signals I'm sure I have right. But could always use a second opinion.


  2. #2
    Supporting Member gs1327's Avatar
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    I am installing one of these on an EFI project- I found that the same unit has different instructions depending on the seller.
    Mine calls the switched 12v lead "power door lock". Typical Chinglish instructions.


    On the 9 pin plug-red is +12v all the time. Black is +12v when the key is on. Green black is negative (ground). It should power up with these 3 wires connected.
    Tom

  3. #3
    Member arieon69's Avatar
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    Quote Originally Posted by gs1327 View Post
    I am installing one of these on an EFI project- I found that the same unit has different instructions depending on the seller.
    Mine calls the switched 12v lead "power door lock". Typical Chinglish instructions.


    On the 9 pin plug-red is +12v all the time. Black is +12v when the key is on. Green black is negative (ground). It should power up with these 3 wires connected.
    I cut off the harness plug to make it more "plug and play". I have Green (Green/Black) from the 9 plug, attached to green from the factory. The colors are almost spot on.
    Last edited by arieon69; 01-11-2017 at 04:45 AM.

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  5. #4
    Super Moderator longdistancerider's Avatar
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    Power wiring would be:
    Red input wire to the ignition switch for #2 Red: memory
    Black out put from the ignition switch for #5 Black: positive
    Any solid Green harness wire for #8 Green black: negative
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

  6. #5
    Member arieon69's Avatar
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    Quote Originally Posted by longdistancerider View Post
    Power wiring would be:
    Red input wire to the ignition switch for #2 Red: memory
    Black out put from the ignition switch for #5 Black: positive
    Any solid Green harness wire for #8 Green black: negative
    I'm using the Pilot Lamp connector. Black. Lt Blue. Orange. Blue/Red. Lt Green. Green. Black.

    Or was that not a good idea? I have a spare wire harness so its okay.

  7. #6
    Member arieon69's Avatar
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    bump this up, still kinda needing help

  8. #7
    Super Moderator longdistancerider's Avatar
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    Using a single indicator light for the turn signals means also using diodes. Otherwise the opposite side lights wil flash also.
    Front indicators

    Sparckmoto.com sells a kit I think will work. Contact Matt to be sure, aka Sonreir on this forum
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

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