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michelle
michelle 3/17/2010
1990 GMC Safari Base 6Cyl4.3L - Engine
i replaced my battery and my alternator and my battery is still not charging.
i replaced my battery and my alternator and my battery is still not charging.
8 Answers
  • RC
    RC 3/17/2010
    Michelle,
    Have you tested the battery voltage while the engine is running? If the charging system is working, the voltage should be somewhere between 13 and 15 volts.
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  • Bobby
    Bobby 3/17/2010
    Assuming everything is correct, this could be a wiring issue, but remeber there is always the chance the new alternator or battery is defective. Test them again first. Then check the all the wires make sure none of them are corroded under the rubber coating, check the grounds make sure they aren't completely rusted. and make sure the grounds are all making a good contact. Make sure the battery terminals are tight.
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  • michelle
    michelle 3/18/2010
    yes i tested the battery while engine running . it reads 12 the battery is good the alternator was tested and reads good (rebuilt from pepboys lifetime gaurantee.)battery is 3 months new. , Where do i go from here? please help, thank u to rc, and to bobby. from michelle
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  • Chris2000
    Chris2000 3/18/2010
    How was the alternator tested? was it bench tested or tested on the vehicle? try checking all of the battery terminals for good connections make sure none are heavily rusted or corroded
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  • RC
    RC 3/18/2010
    The charging system is not working if the battery only reads 12 volts (while the engine is running). Sounds like the alternator is bad. I'm sure pepboys would test the system for free if you bought the alternator there.
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  • HouseCallAuto
    HouseCallAuto 3/19/2010
    Hi Michelle,

    Who will be the person that will fix the car? The person that will fix this car will ultimately be the person who will have to do specific circuit tests to determine if the alternator is a defect or is there a broken wire or burnt fusible link in the wiring harness that attaches to the alternator. I suspect that the fusible link that runs from the starter B+ terminal to the alternator B+ terminal is open (broken or shorted) and this needs to be checked among other things. It is not so difficult a problem for an experienced tech to solve.

    Kevin - HouseCall Auto Mechanics
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  • michelle
    michelle 3/19/2010
    Thank you Keven , Cris and, .RC Iam leaning toward defective wireing i will trouble shoot today and see what happens. talk to you guys later tonignt and let you in on the results. have a lovely day !!!! Michelle
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  • greasymoney
    greasymoney 4/1/2010
    I've had poor luck with rebuilds from some auto parts stores. First, verify that the alternator is good. It should produce 13 volts or better, depending on the how well charged your battery is.

    One easy to check problem area with GMs is the connections at the starter. Check for loose wiring there.
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