1979 ford f150 4x4 351 w

Asked by Mar 25, 2017 at 08:38 PM about the 1979 Ford F-150

Question type: Maintenance & Repair

My trucks alternator won't charge right but its bran
new I've changed it like 3 times its saying its only
reading 12 volts being put out. What could cause

3 Answers


You have an external voltage regulator that might need replaced. If you have the GEN type setup (vs ammeter) there is a shunt in the wire harness that may be bad, a lot of people just upgrade to newer type alternator and harness.

Could the alternator not charging right cause the truck to skip out when put under pressure?


voltage regulator mounted above the wheelwell

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