Why is my truck not charging ?

Asked by Bekka Apr 16, 2021 at 10:37 PM about the 1998 Ford F-150

Question type: Maintenance & Repair

Good battery. Good alternator , (according to AutoZone )
But , it's not charging .  The fuse in the little black box on
the firewall was blowed. Changed it. Still not working

2 Answers
27,570

oilyspill answered 3 years ago

Note the diagram. Make sure battery has a full charge? If battery is down, use a charger and get it charged up. make sure battery connections all good, positive and negative. See the mega fuse and inline fuse, check both, hot all the time. Use a test light to check voltage at the fuse. see the 10 amp fuse, right side of diagram, goes hot with key on, check it. That voltage through charge indicator to generator is excite voltage, w/o excite voltage, the generator won't charge. The bat terminal at generator, hot all the time, even with key off, check that. let know what you find? good luck

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