Question about 1989 Ford F 150

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89 F150 starting problem

I have an 89 F150 302, about 6 weeks ago the battery was dead. I replaced it and the truck started up fine. The next day the battery was dead. I replaced the alternator and it is working fine. The truck starts up and runs fine, then when I shut it off it will not start(not enough juice to turn starter). If I let it sit for a day or two it will start right up, then wont start after I shut it off! I replaced the soelenoid and pcm relay they are working fine. My grounds all look good but something is happening to make it not start. Any ideas will help. I am at my wits end. Sometimes when I am driving the yellow "Check Engine Light" will flash a few times and my battery power will drop about by half, then it will pick right back up.

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  • yadayada
    yadayada May 11, 2010



    Run the trouble codes on the PCM/ECM and check fuel pressure while cranking and spark, also there is an issue with the ignition switchs, the key cylinder but the actual electrical switch, the upper and lower halves of the switch seperate and can cause this no start.

  • Ricardo Loranca
    Ricardo Loranca May 11, 2010

    check your starter you might have an open circuit causing the drain in your battery

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If you see the battery voltage dropping by 50% periodically then you have a serious short somewhere.
The first thing to do is be certain no lights are on then disconnect the battery ground.

If you don't have an amp meter then then disconnect the ground wire from the battery and connect a 12 volt test light from the cable to the battery post[If it does not light then reverse the leads from the test light because some are polarity sensitive].

If the bulb lights and you are sure nothing is on, the key is off and the doors are closed; then pull all the fuses and hook-up the test light.If the light still comes on you will probably need to seek some professional help.

If the light does not come on, then plug the fuses in one by one until you see the test light come on.
Unplug the last fuse, if the light goes out then that is the circuit where the short is located.

Posted on Jan 07, 2009

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