2004 f150 5.4 3v charging issues

Asked by Mason432 Oct 06, 2019 at 08:39 PM about the 2004 Ford F-150 Lariat SuperCrew 4WD

Question type: Maintenance & Repair

Long story short, engine went out and needed to be
replaced. I replaced it. Now im having a strange charging
issue. It wont charge past 12.12 volts UNLESS... I remove
the alternator cable from the battery post and reconnect it
while its running. Then it over charges to atleasrt 16v.. If i
shut it off it goes back to not charging... Had the alternator
tested 5btimes at autozone. It passed all 5 times. Had no
issues before the engine swap. And the truck will run and
drive for hours without the lights on. The truck will also die
if i remove a battery terminal the truck shuts off. PLEASE
help. This is driving me up the wall.

1 Answer

F_O_R answered 5 years ago

Bad voltage regulator? Don't remove the battery cable with the engine running unless you want expensive electronics damage!

Mark helpful

Your Answer:

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