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    jtw677889's Avatar
    jtw677889 Posts: 2, Reputation: 1
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    #1

    Aug 22, 2011, 12:07 AM
    1989 f150 battery will not stay charged
    Recommendations or hint welcome
    jtw677889's Avatar
    jtw677889 Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Aug 22, 2011, 12:08 AM
    Hints welcome
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #3

    Aug 22, 2011, 06:20 AM
    You could disconnect 1 battery cable, place a bulb/socket between the connection, it will be lit if you have a draw/drain, you could then remove fuses 1 by 1, may need to remove all to be sure, Identify where they go back, maybe disconnect alternator, regulator, to see if they are the culprit.
    A DC Amprobe is nice for this as it shows any charge or draw at 1 time.
    You either have a bad battery, alternator not charging, or a drain?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #4

    Aug 22, 2011, 06:29 AM
    . Remove and fully charge the battery. Most auto parts stores will do this for free. Ensure the battery is good or get it replaced.

    . Check the regulated battery voltage, while the engine is idling. It should be 14 to 15 volts. If it's low, replace the voltage regulator/brush holder assembly. On older F-150s, access is on the back of the alternator. Remove the four Torx 20 mounting screws and remove the regulator/brush holder. Use a small drill bit or paper clip to retain the brushes, until the new regulator/brush holder is installed. Disconnect the negative battery cable, prior to working on the alternator.
    Dr1757's Avatar
    Dr1757 Posts: 186, Reputation: 25
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    #5

    Aug 22, 2011, 06:46 AM
    How old is the battery? If it's more than 3 years old you probably need to replace it.
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