New coils no spark 1956 15 hp evinrude

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    trainsnmore


    Replies: 13
    Topics: 3
    #217659

    Here are a couple pictures. One of the old and the new. I believe they are right. Let me know if you disagree.

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    trainsnmore


    Replies: 13
    Topics: 3
    #217660

    E327C7E8-7D54-44F8-8B68-35BF97C96960

    9D416CF0-6F93-4D29-9556-926ABA9A6CEC

    • This reply was modified 3 weeks, 3 days ago by Avatartrainsnmore.
    • This reply was modified 3 weeks, 2 days ago by MumblesMumbles.
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    crosbyman

    Canada Member - 1 Year
    Replies: 1668
    Topics: 199
    #217667

    How do I check continuity from end of spark plug wire to the coil?

    with coils primaries connected (one is grounded)

    stick one probe of the VOM in the plug boot spring clip and one touching the engine body set the meter above 10K ohms range or better yet use a digital meter

    you MUST see 4-8Kohms on each wire if not the coil secondaries are open or the plug wires are open

    simple test … post results

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    crosbyman

    Canada Member - 1 Year
    Replies: 1668
    Topics: 199
    #217669

    see pic

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    Evinrude 25


    Replies: 39
    Topics: 7
    #217672

    Look good to me! you should get the spark.

    Tubs
    Tubs

    US Member - 1 Year
    Replies: 3233
    Topics: 175
    #217676

    You're only as smart as the person you're talking to.

    • This reply was modified 3 weeks, 3 days ago by TubsTubs.
    • This reply was modified 3 weeks, 3 days ago by TubsTubs.
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    jeff-register


    Replies: 1223
    Topics: 49
    #217700

    Checking the secondary winding is easy. Go to your highest resistance setting on your meter. Take one meter lead to the magneto plate & the other lead to the end of the spark plug wire. That will measure the resistance of the secondary winding. Also leave the lead on mag plate & test for resistance between the mag plate & the block of the powerhead.
    Reason I suggest this test I had resistance between the two & had to add a bonding wire between the mag & block.
    When building a mag for a 2 cylinder motor you have 2 complete magneto systems. Mine had a current reverse & the output from 1. coil was going into 2. points & turning them gold they got so hot. I had cleaned all mating surfaces with acetone & lightly lubed it. With a bonding wire problem was solved, easy start motor now. If you have very high resistance testing the coil you may have a blow-out where the coil arced from the winding to ground. This would cause a break in the winding only connected by a piece of carbon where a winding was there. Carbon is a material used to make resistors too.

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    trainsnmore


    Replies: 13
    Topics: 3
    #217701

    Good afternoon,
    I did the test. Top plug wire showed19.7 and the bottom plug wire showed 8.7. Mag plate to block zeroed out. Hope this is good. Does this show that the plug wires are good to the coil. Trying to eliminate why I have no spark. Timing was set with a meter from marks on coil plate and flywheel.
    Gary

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    jeff-register


    Replies: 1223
    Topics: 49
    #217702

    Something odd about that much of a difference in resistance. Time to measure the coil itself connecting directly to the hi voltage (secondary terminal. ) and mag plate. You may have bad spark plug wire and or terminal rusted. If I may ask what resistance scale did you have your meter set on? The meter should say ohms, then times 10, 100, 1000 & so on to meg ohms. I have no idea why with new coils would show that much of a difference in resistance other than bad wires or connectors. What kind of spark plug wire was used? Must be copper wire, solid or stranded Yes when you show no resistance on the mag to block that is a great reading.
    Check everything like the factory wire terminal where the connector is crimped on the wire. Electrical is like a chain, one bad link causes an open connection & system will fail. I in the past have always soldered the connector to the wire. Just added insurance it will not fail in a humid place.
    Please pay attention to details & keep the magneto super clean. Everything will conduct electrical even air. As in lightening. Wish you were in Phoenix Arizona, I would help you in person,
    Anyone have anything to add to my suggestions?

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    crosbyman

    Canada Member - 1 Year
    Replies: 1668
    Topics: 199
    #217703

    yep pull the coils test individually the results should be 4-8Kohms the same from the end of the plug wires boot .. if not …..look for corrosion..better yet just replace the wires and recrimp the clips

    Joining AOMCI has priviledges ๐Ÿ™‚

    Mumbles
    Mumbles

    Canada Member - 2 Years
    Replies: 4597
    Topics: 437
    #217708

    It might be time to check the condition and continuity of the spring terminals inside the spark plug boots. They should be nice and clean with no sign of rust or corrosion and be making a good contact with the plugs wires copper core.

    DSC00086

    DSC00031

    Blue-Spark-Plug-Boot

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    yumagoat


    Replies: 1
    Topics: 0
    #217713

    Put a lot of coils in fleetwins and just had the same problem with new coils on a 55 aquasonic 15…..put old coils back in and the spark was fine. The new coils were chinese made and I probably cannot say where I got them here but if you ordered them the largest online store be careful…they did allow me to return them for credit. I do not think they generated enought secondary voltage to jump a tiny gap.

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    cajuncook1

    US Member - 1 Year
    Replies: 739
    Topics: 66
    #217715

    If everything checks out. You may have to use the old coil laminates and put the new coil core on the old laminates. The aftermarket brands can have laminates that are not the same measurements and can cause an issue with improper laminate to flywheel magnet gapping. Thus causing no spark, but you must recheck your ignition plate. Could be something simple as poor contact. Clean all contacts going to ignition plate and the ignition plate to the motor.

    Also, take a picture of your coilsโ€™ laminates facing from a horizontal view. Want to see if those laminates are mounted / positioned flush with the Magneto plateโ€™s line up bosses.

    Cheers,
    Cajun

    • This reply was modified 3 weeks, 2 days ago by Avatarcajuncook1.
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    Monte NZ

    International Member - 2 Years
    Replies: 107
    Topics: 35
    #217725

    Interesting reading Tub’s post re energizing the magneto using an electric drill, in that about a year ago I was having similar problem with the magneto on a British Seagull I was restoring and spinning the motor over for several minutes brought the spark back again……. If I remember correctly, I heard of it from a chap who services Seagulls here in NZ.

    Monte NZ

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    crosbyman

    Canada Member - 1 Year
    Replies: 1668
    Topics: 199
    #217728

    gents…. I think we still do not have valid results of proper testing on the basics……..mainly :

    … resistance of each coils windings (primary & secondary) on their own
    … and then, all the way from plug boots to secondary windings of each coil ( above posted results seem suspect)

    “yep pull the coils test individually the results should be 4-8Kohms the same from the end of the plug wires boot .. if not โ€ฆ..look for corrosion..better yet just replace the wires and recrimp the clips”

    Joining AOMCI has priviledges ๐Ÿ™‚

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