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Thread: Coil relay mod

  1. #1
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    Default Coil relay mod

    So the past week or so I've been chasing down voltage loss from my coils and have been getting little by little back, but I'm still only at 7.5v at the coils.

    Alot of people have been suggesting doing a coil relay mod, having the coils directly connected to the battery ensuring you get all the voltage from the battery.

    Heres my thought, if that's how I have to get all the power to my coils, wouldn't there still be an electrical issue going on through the bike?

    What's your thoughts on this mod? Would love input from somebody whos done it.
    Ian

    1982 GS650GLZ
    1982 XV750

    Got a twin

  2. #2
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    You need to do a voltage drop test on the coils. That will help you find the voltage loss problem.
    1981 GS1100E
    1982 GS1100E



    "It is the mark of an educated mind to be able to entertain a thought without accepting it." Aristotle


  3. #3
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    Quote Originally Posted by metalfab View Post
    You need to do a voltage drop test on the coils. That will help you find the voltage loss problem.
    That's what I've been doing, ive cleaned anything that goes with the ignition and I did gain about a volt back but in still at 7.5volts at the coils, assuming that putting the positive probe on the positive coil connection and negative probe on the negative connection to see the total voltage.
    Ian

    1982 GS650GLZ
    1982 XV750

    Got a twin

  4. #4
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    Relay mod isn't needed if all the wiring connections etc are clean and maintained.
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  5. #5
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    Quote Originally Posted by zed1015 View Post
    Relay mod isn't needed if all the wiring connections etc are clean and maintained.
    That's my exact thoughts, I didnt really want to do it because I know that would mean I still have a connection issue, the thing is I've cleaned everything that goes to the ignition setup, and while I gained a bit of voltage back, I'm not even close to where I should be.

    The only thing I haven't touched is in the wiring harness and that's where the killswitch wire attaches to the coil wires. I can ensure everything else has been cleaned
    Ian

    1982 GS650GLZ
    1982 XV750

    Got a twin

  6. #6
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    Quote Originally Posted by timebombprod View Post
    That's my exact thoughts, I didnt really want to do it because I know that would mean I still have a connection issue, the thing is I've cleaned everything that goes to the ignition setup, and while I gained a bit of voltage back, I'm not even close to where I should be.

    The only thing I haven't touched is in the wiring harness and that's where the killswitch wire attaches to the coil wires. I can ensure everything else has been cleaned
    One of the main culprits is the actual kill switch on the bars.
    If not already done it is the copper contacts in the switch that get gummed and tarnished .
    Mikuni Viton Choke Plunger Seat Renewal.
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    https://www.ebay.co.uk/itm/254380193...84.m1555.l2649




  7. #7
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    Quote Originally Posted by zed1015 View Post
    One of the main culprits is the actual kill switch on the bars.
    If not already done it is the copper contacts in the switch that get gummed and tarnished .
    It has been cleaned externally but with the soldered bits and the actual wire those have not been replaced.
    Ian

    1982 GS650GLZ
    1982 XV750

    Got a twin

  8. #8
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    Default

    Quote Originally Posted by zed1015 View Post
    Relay mod isn't needed if all the wiring connections etc are clean and maintained.
    So true. While there are good points for a relay mod like less load on switches I don't consider it a fix for low voltage but more of a work around for not fixing the original issue. Contacts in the bottom of the ignition switch are usually bad and overlooked as well.
    '84 GS750EF (Oct 2015 BOM) '79 GS1000N (June 2007 BOM) My Flickr site http://www.flickr.com/photos/soates50/

  9. #9
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    Quote Originally Posted by Sandy View Post
    So true. While there are good points for a relay mod like less load on switches I don't consider it a fix for low voltage but more of a work around for not fixing the original issue. Contacts in the bottom of the ignition switch are usually bad and overlooked as well.
    Completely agree, I did make sure to clean those contacts, mayne I'll check where they touch aswell
    Ian

    1982 GS650GLZ
    1982 XV750

    Got a twin

  10. #10
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    When you say 7.5V at the coils, is that with the coil-to-ignitor lead disconnected?
    ---- Dave
    79 GS850N - Might be a trike soon.
    80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
    79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
    92 XJ900F - Fairly Stock, for now.

    Only a dog knows why a motorcyclist sticks his head out of a car window

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