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    Scagman's Avatar
    Scagman Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Oct 10, 2007, 02:13 PM
    Mazda MPV Charging system
    I have a 1990 MPV, the voltage regulator failed (which meant a new alternator). After renewing alternator the battery failed, renewed it. NOW after starting the engine the alternator charges 14.5 volts for a few minutes then quits charging (12 volts). The alternator will begin charging after an hour or two of shutdown, and then for only a few minutes. Incidentally the charging light does not illuminate on the dashboard. Before I buy another alternator and go through the nightmare of renewing it has anyone got an idea of what's wrong?

    Thanks,
    Rutledge, TN
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Oct 10, 2007, 05:36 PM
    The problem may reside with the ECM. You may want to get it diagnosed or substitute a known-good ECM.
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