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Ford/1990 mustang 5.0 electrical (battery not charging)


Had Advance Auto check it out, they said it was a bad alternator. Under a load it only had about 12amp output. I replaced it only to have the same thing happen, which was the battery draining after sitting a couple of days. They say the battery is good. I had a similar problem 2 years ago when battery would not hold a charge. I replaced the ground cable and it solved that problem. Any ideas besides taking it to Ford and paying a fortune to have them run diagnostics?

Hi the best place to start is disconnect the negative terminal, connect a test light between the cable and battery and start pulling fuses till the light goes out. If you have a volt meter. That reads AMPS. Do the same using the meter just gives you a better idea of the kind of draw and size you have. Try this and get back to me


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brian howard


I can answer most question from drive ability to electrical, electronics and almost all check engine light concerns from 2000-2013 vehicles


I am a Ford Certified Master technician. I specialize in drive ability concerns, but can help with most concerns from steering to suspension and climate control relating to Ford And Lincoln/Mercury products from model year 2000 to current

Ford Certified Master Technician

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