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2003 gmc battery not charging flashing on display

proper diagnosis

2003 gmc battery not charging flashing on display

Postby troyfast1 [OP] » Dec 04 2015, 1:43am

battery not charging and red battery flashing in instrument cluster.... volt guage dropped from 14 volts to 12 volts and seems to be slowly dropping.
the truck cranks right up and runs fine.
I am sure it is the battery and or the alternator.

whats the proper way to test the alternator on the vehicle ????

2003 GMC sierra with 4.8 liter
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Re: 2003 gmc battery not charging flashing on display

Postby esox07 » Dec 04 2015, 2:25am

Take it to an auto parts store. Most will test both the battery and Alt for free.
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Re: 2003 gmc battery not charging flashing on display

Postby troyfast1 [OP] » Dec 04 2015, 2:42am

i appreciate the input. but i am a little reluctant to take it to a parts store... since there job is to sell parts

first they will say its the battery. and i purchase 1

then they say it the alt. and i have to purchase 1 of those
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Re: 2003 gmc battery not charging flashing on display

Postby 19trax9519trax95 is online! » Dec 04 2015, 4:20am

Ask them to see the test results for yourself and then report them on here.

The best way to test an alternator is a load test.

This loads the alternator and you'll see what it will put out.

A battery load teat is also helpful to determine the battery health.

However, parts stores don't do load tests. They have a digital tester that just measure internal resistance in the battery and voltage of the alternator.
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Re: 2003 gmc battery not charging flashing on display

Postby troyfast1 [OP] » Dec 09 2015, 3:00pm

update = battery tested good, although it was low on charge because the alternator was not working properly.

$90 later and a new alternator ---- truck runs great
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