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Posted on Jan 02, 2017
SOURCE: 2004 F350 dually crewcab turbo
Below is your wiring diagram. So does the battery run down or not? At 12 volts, the battery should run down. Here are a couple things to check. The grey 20 gage fusible link from the battery to the alternator runs the stator coil. You could try jumping that with a regular 14 gage wire to see if the voltage will jump up (should be at least 14 volts). The other thing is with dual batteries (which I think you have), if one battery is bad, it could pull down your voltage. Try unhooking the negative terminal on one battery at a time to see if the voltage increases. Let me know if you have any questions.
Posted on Dec 06, 2010
you may have a problem with the ecm(computer)that is causing your problem.you also may have a defective alternator even if it was new one.
Posted on Oct 17, 2011
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