Coil / alternator

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  • Jezbob
    Member
    • Aug 2019
    • 1

    Coil / alternator

    Sudden stalls after 20 mins suggested elec rather than fuel. Both my fuel pump and coil were crazy hot. Replaced coil with a 3 Ohm resistance coil and same result. Replaced spark plugs - the same was about to happen but i stopped before stall to save coil.

    So now to the cause - I'm thinking is it the current from the alternator that is too high? My coil has internal resistance of 3 Ohms, and I think the alternator is supposed to have a section that is a resistor attached to it. So should I just buy and fit some extra resistor to put somehow between alt and coil?? Or is it time for a new alternator?
    And finally what of the hot fuel pump? Is it just a coincidence that it too is faulty? Or could the ignition switch which is connected to both the pump and the coil (am i right here?) somehow be frying them when the engine ids running. My amateur mind can't really see how that could happen...
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  • joe_db
    Afourian MVP
    • May 2009
    • 4474

    #2
    First step - buy a digital voltmeter.
    Second step - measure voltage at alternator, battery, and coil at cruise RPMs.
    Joe Della Barba
    Coquina
    C&C 35 MK I
    Maryland USA

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