Changed alternator battery light still on
80

Asked by 98ferd Nov 05, 2019 at 11:56 AM about the 1998 Ford F-150 XLT Extended Cab SB

Question type: Maintenance & Repair

98 f150 4.2l battery light came on while
driving. Travelled 20 miles then truck died.
Boosted it and it ran until boost was
dissconected. Put battery on charger truck
ran to get home. Replaced alternator same
issue is happening

1 Answer
4,310

lincolnscott49 answered 5 years ago

If the battery is low on charge and jumped to start the alternator is working overtime and can burn up the internal voltage regulator. Both must be good. If I get a dead battery i have it charged and checked under a load first and check for why it drew down. Removing and checking the alternator as well at the same time off the car is also a good idea but can be tested for output while on the car after battery is charged and good.. If bot check out fine and battery is charged I then check for a parasitic draw..

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