Battery indicator light on after battery replacement

Asked by GuruBK4Y4 Jan 09, 2019 at 03:20 PM about the 2007 Ford F-150 XLT 4WD

Question type: Maintenance & Repair

I have a 2007 F150 that sit in my garage for 7 months.  When I got home the
battery was dead so I charged it and truck stated fine but battery would not
hold a charge.  Since the battery was dated May 2013 I figured it was the
battery plus when I removed it I noticed that the negative post had started
separating from the battery housing.  Once I installed the new battery, the truck
started right up, however, the battery indicator light was on.  I drove the truck a
few miles and the light would go off then come back on periodically.  Today I
drove the truck for 25 miles and the light stayed on permanently.  I have already
cleanened the posts and terminals.  Should my next step be to have my alt
checked?  Trying to eliminate all possible causes myself before having to take
my truck into a repair shop.  Any help or suggestions will be highly appreciated!

1 Answer

F_O_R answered 5 years ago

I would go ahead and check the alternator. If you have a multimeter check the voltage across the battery terminals with the engine running. The reading should be 13.5 to 14.5 volts or something close to that. If it is reading 12.5 or lower the alternator is not doing anything.

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