CDI coil connection conundrum
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  1. #1
    Junior Member ninjabraap's Avatar
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    CDI coil connection conundrum

    Hey everyone!

    Working on US 1979 CX500C, the CDI seems to have been replaced with a unit similar to the Ignitech CDI replacement. At some point I disconnected the ignition coils, marked them with tape, and then continued working on the bike. However somehow the tape fell off in the process of working on the bike, and I couldn't tell which coil went to which wires on the CDI. The original wiring diagram indicates that the Pink and Yellow wires on the coils went to Pink and Yellow wires on the Ignition unit. The new CDI though does not use Pink and Yellow, but rather Orange and White similar to the Ignitech CDI unit. Does anyone know which wire's go to which coil?

    In short, on the Ignitech CDI, Pink (Right Coil) and Yellow (Left Coil) goes to which wires (Orange and White)?

    I already overheated and blew the Left coil, and had to replace it. I'd much rather not do that again.
    Motovlogger and motorcycle mechanic in the PNW.

  2. #2
    JC
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    Super Moderator JC's Avatar
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    Got a photo of the ignition box?

    From here;

    https://motofaction.org/motorcycles/...cx500-dccdip2/

    White -> yellow
    Orange -> pink

    That's assuming that yellow/pink are on the original sides (left/right).

  3. #3
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    hooking the coils up backwards wont hurt them it just will make the motor not start and only back fire once in awhile

    if that happens reverse them and start it up
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  5. #4
    Junior Member ninjabraap's Avatar
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    Yeah that's what I thought, that's why I was confused when it overheated. I guess I'll just replace and plugs and check the gap. Hopefully it doesn't happen again, I mean there doesn't seem to be any reason it should with the new coil. It's literally brand new, and with new plugs, proper gap, and the correct wiring (which it wouldn't run without) it should be fine as far as I can see. Just wanted to see if anyone else knew anything I didn't and had experienced something else. along those lines.

    I found the thread on here Ignitech proper installation and wiring, so that'll help.

    It just occurred to me that I forgot to mention the fuse on the positive battery terminal also blew simultaneously when this happened. Doesn't seen like much of a coincidence. It wouldn't turn over until I replaced the fuse of course.
    Motovlogger and motorcycle mechanic in the PNW.

  6. #5
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    What kind of coils do you haveIt sounds like you have sone mixed up wiringAny chance of some pictures???
    GET AN OIL FILTER ADAPTER

    Order The Quick Build Exhaust Pipes


    GET A QUICKSET VALVE TOOL


    Way to many bikes to maintain this list LOL !!

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  7. #6
    Senior Member cx500slacker's Avatar
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    I have the ignitech instructions

    Pink goes to the Ignitech Orange
    Yellow goes to ignitech White
    Black/White goes to the ignitech Green
    Wasaga Beach, ON, Canada

    1981 Honda CX500 Custom
    Named: TBD

  8. #7
    Senior Member cx500slacker's Avatar
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    Sorry didn't see that you found the installation thread. Disregard
    Wasaga Beach, ON, Canada

    1981 Honda CX500 Custom
    Named: TBD

  9. #8
    Super Moderator CXPHREAK's Avatar
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    Blew the fuse? Are you sure this isn't a TI bike? Or if an ignitech install on CDI that something is wired wrong?

    Photos would be helpful.
    Rebuilding Handlebar Switches

    http://s1085.photobucket.com/user/CXPHREAK/library/Switchgear%20rebuild?sort=6&page=1

    Rider 81 500C, Thingy Born a 78Z. Ozdeluxe born an 80 shadow.

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  10. #9
    Junior Member ninjabraap's Avatar
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    It's definitely not TI. The fuse was on the positive terminal going to the battery (in other words right next to the battery), not the CDI. The CDI unit looks almost exactly like the Ignitech one, and has the same wiring scheme and colors.

    I'll post photos later, I'm in class right now.
    Motovlogger and motorcycle mechanic in the PNW.

  11. #10
    Junior Member ninjabraap's Avatar
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    Okay finally got pictures last night. Also, pulled the spark plug from the left side, it's pretty bad. Could explain why this happened.

    Pictures are of the CDI and harness, then the fuse I was talking about with the battery terminals. Next is the Orange, White, and Green wires. The green never was detached, so it's been consistently plugged into the Black/White wire. I also have pictured the still intact Right Coil, the spark plug, and the new coil I bought for the left. I also have a new coil for the right as well to match the new left. I'm going to buy new plugs, since they're bad anyway.

    Please excuse the electrical tape on the new coil yellow wire, it's temporary just for testing, I'll be replacing it with shrink tubing once this is figured.

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    Last edited by ninjabraap; 01-11-2017 at 10:19 AM.
    Motovlogger and motorcycle mechanic in the PNW.

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