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    LeftHandwrench's Avatar
    LeftHandwrench Posts: 1, Reputation: 1
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    #1

    Jul 20, 2009, 09:04 PM
    Coil wiring
    When the switch is in the on position is there 12v power to the ignition coil on a four cylinder gas tractor?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Jul 20, 2009, 10:37 PM

    In the old days the coil was fed by a resistor in the on position. While cranking, the resistor was bypassed and the coil got full voltage.
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #3

    Jul 21, 2009, 08:28 AM
    Quote Originally Posted by LeftHandwrench View Post
    When the switch is in the on position is there 12v power to the ignition coil on a four cylinder gas tractor?
    Yes, there should be power at the coil positive terminal.
    The "Negative" terminal is actually the ignition trigger. When it gets a trigger pulse, the coil field collapses and the coil fires.
    One terminal will light a test light with the ignition in the ON position and the other should flash a test light during cranking.
    I hope this helps.
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