Question about 1999 Ford Explorer

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Needs jump battery and alternator test good but when sits overnight and needs jump will work fine all day start fine tests good then wont start after sits overnight

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  • longie1 Feb 05, 2009

    I did take it to autozone and they tested Battery & Alternator all good even at high rev also night time is only about 45 so not cause of cold weathe and thanks for trying

  • longie1 Feb 05, 2009

    I could have access to meter but not sure what to do also cant find any diagram in chiltons for main fuses and relays how this one is laid out on 99 Explorer Sport doesnt quit mach any of the pictures

  • Chuck Martin
    Chuck Martin May 11, 2010

    Do you have access to an amp meter to test for drain?

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Install amp meter on 10 amp scale between battery neg cable,turn on a lamp like hood lamp to make sure it is reading correctly and fuses in meter are not blown.Wait at least 35 minutes to give modules a chance to go into sleep mode and record reading should be 0.05 amps or less. If more than this start disconnecting each fuse in the battery junction box one at a time to see if you can make it go away. Be paitent here while doing this pausing a couple of minutes between each one to give things a chance to steady out. Also if you have a draw on the system you will also need to disconnect alternator to make sure it is not drawing it.
Now if you have a draw and the alternator is not the cause and you find pulling one of the fuses makes it go away then post back on here which one it is and I will tell you where to go next.

Posted on Feb 05, 2009

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  • Master
  • 416 Answers

Check the battery for charge and alternator for power (free at Autozone) It might be deposited/rusted contacts on alternator and battery to reduce the electric current to battery from altrnator so battery just draining out. Also if it is very cold overnight (less than 0 F) battery lost the cranking power.
Please kindly let me know if the information provided was usefull for you or you need more info
Good Luck

Posted on Feb 05, 2009

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