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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
K i got a 1990 gt w/ 306, e303 cam, typhoon upper n lower,just a mild build..the battery is relocated to trunk...the other day was driving up the road and some idiot pulled out right in front of me.. had to stomp brakes, went side ways, got it back...then my car started reading over 18 volts for battery..got out checked every thing,nothing out of odinary..so drove home and still reading over 18 thenwhen i cut it off the battery was fizzing out water or acid or whatever...put diff battery in same thing....any ideas?
It is the voltage regulator in the alternator. I think you may have to get a whole new alternator. Don't run it like that, it could burn up anything electrical in the car.