Question about 1989 Ford Mustang

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I have a 1989 mustang LX with a carberated 302 engine. The alternator will not charge the battery. I replaced the alternator and still have the same results. The blinker lights illuminate on the dash when the lights are turned on. I can't find the short.

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  • Ian Summerfield
    Ian Summerfield Jul 09, 2010

    disconnect the battery,and put a voltmeter between the two disconnected parts ie battery and cable.that voltage will tell you how much voltage is being drained.go around the car,disconnecting things until short is found.simple way to check for charging is to put voltmeter across battery,should read about 13.2,start it up and rev a bit,should go up to about 14.5 volts .that means alternator charging.also put voltmeter across battery and wind engine over,if it drops below 10v,battery is suspect.also check your earth lead,ideally should go directly to the motor

  • dakota128 Jul 09, 2010

    I pulled the battery cables off and the voltage is .05 volts. With the car running, the volts are reading 12.2 volts and 12.1 when I rev it up. I changed the alternator and also had it checked. Still have the same problem. I checked all of the wiring from the alternator and plugs to make sure there were not broken wires. I replaced the 4awg wire going to the starter due to it grounding out on the header.

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  • Ford Master
  • 6,826 Answers

Make sure the alternator main wire(the large one) is showing 12 volts,with the key off,if it is not,this is the problem,just run a wire as big,or larger than the one that is on there already.

Posted on Jul 09, 2010

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