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
that

3 Answers

31,315

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?

5

voltage regulator mounted above the wheelwell

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