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Thread: HELP - Landy won't start - suspect ignition coil

  1. #1
    Join Date
    Jul 2016
    Location
    Gold Coast
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    437

    HELP - Landy won't start - suspect ignition coil

    Hi All,

    After working fine on the weekend, suddenly my 2a won't start. I have 12V on the ignition line from the switch, so I guess next thing to check is the coil.

    Can anyone suggest the best way to test the coil in situ please ?

    Thanks
    John

  2. #2
    Join Date
    Oct 2014
    Location
    Northern NSW.Australia
    Posts
    1,493
    Hi John.
    Disconnect coil. Multi Meter across + and -
    should read above 3 ohms, unless it has a ceramic resistor in line.
    Then more like 1.5 to 2 ohms.
    How to Diagnose and Test an Ignition Coil

    whitehillbilly

  3. #3
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
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    25,133
    bridge the points with a 12v5w light if the light doesnt blink on and off as you turn the engine over with the crank handle and the ignition turned on its the points.

    now if the light is blinking. move onto the next step.

    remove the light from the system, remove a plug lead and a plug, put them straight onto the coil and anchor the plug to the rocker cover or the alternator and turn the engine over again. If it spits a nice blue spark, its not the ignition system in general but may still be the condensor.

    if you're any good with a multi meter a quick google should give you the resistances to expect from the primary and secondary windings. check those and if they're on spec then you should be good for a start.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  4. #4
    Join Date
    Sep 2012
    Location
    Westlake ,brisbane
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    2,227
    Check points haave not closed up , also check points surface if it looks scaley or burnt could be condensor.

  5. #5
    Join Date
    Jul 2016
    Location
    Gold Coast
    Posts
    437
    Thanks guys, much appreciated, I look at this today.

  6. #6
    Join Date
    Jan 1970
    Location
    Central West NSW
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    23,141
    Another possibility not covered - the wire that earths the plate carrying the points, inside the distributor. If this is broken you may or may not have ignition.

    When my coil failed it was due to corrosion inside the socket on top.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  7. #7
    Join Date
    Oct 2014
    Location
    Northern NSW.Australia
    Posts
    1,493
    I did melt plastic insulation, causing points to earth out on the 25D Dissy, last week.
    Leaving coil attached to battery caused problem. One wire Bat to coil. other , exciter wire, bat to Alt.
    Just to get it running.

    whitehillbilly

  8. #8
    Join Date
    Jul 2016
    Location
    Gold Coast
    Posts
    437
    Thanks guys for all your useful suggestions. Annoyingly I couldn't get it going myself so I called out an auto electrician, and as luck would have it the Landy started just before the auto elec arrived . Turned out to be the high tension lead between the coil and distributor was a bit crusty, it might be the original, who knows.

    Anyway, all is well now.

    Cheers,
    John

  9. #9
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    23,141
    Thanks for letting us know, it is really useful for others coming along later and looking for solutions to their problems.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

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