Question about 1987 Ford F 350

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Wont hold charge in expedition

Installed a radio acouple hours later it shorted the alternator so i replaced it still had a problem so had battery checked failed so replaced batt and started car a hour later battery wasnt holding charge to it back it had burned out a cell so got new one did the same thing checked alternator tested good so now dont know what it is used test lamp and checked fuses there good taped all wires for radio so no loose ones do u know what it might be.

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  • g_peco Nov 11, 2008

    i disconnected neg battery post and expedition shut off i changed the alternator had it tested befor i put it in took out radio and taped all the wires and it still wont hold charge

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Did you ever find the problem with your alternator? I'm have the same problem

Posted on Nov 21, 2008

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  1. Check the wiring of the new radio installed as follows..
  2. Disconnect battery ground
  3. verify radio ground wire is grounded to metal
  4. verify radio hot wire (normally red and thick) is connected to a power source that is off when the ignition key is in the "off" position.
  5. verify that the always hot wire is connect to a constant 12v power supply even with the ignition off.
  6. make sure the pwr antenna wire if not used is taped at the tip and not touching any metal.
  7. verify that all speaker wires are connect correctly and not shorted to ground.
  8. connect battery ground you may get a small spark if your courtesy lites work.
  9. start engine verify your battery is charging by disconnecting the battery ground cable while the engine is running, it should continue running if it don't, alternator maybe bad.
  10. If it continues running problem solved..

Posted on Nov 11, 2008

  • gt280z Nov 12, 2008

    You may have a fusible link burnt out or a voltage regulator I'm not sure without a wiring diagram of the electrical system. You need a diagram of the charging system to trace where the open is between alternator and the battery.

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