Question about 1993 GMC Sierra K1500

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New alternator not charging on 93 gmc pick up

I just got a new alternator on my pickup but yet it is not charging like it should be, i have had it tested at napa, as well as auto zone. and both say it is good! plz help

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  • kleebrady Jan 19, 2009

    yes they tested the battery, any hints on where to start checking for malfunctions???

  • Anonymous Jan 21, 2009

    ok, i asked a friend n he checked the alternator while running and it tested fine, he said to buy a hand amp gauge and see if it was fluctuating with the dash gauge, which it is he said it was a bad ground somewhere????? any ideas on where to start???? thnx.

  • Chris Hall
    Chris Hall May 11, 2010

    When AutoZone tested the alternator, did they test the battery as well? Tis the season for batteries to fail!



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Ok. Then your problem is more-than-likely a wiring issue.

Track the wires between the alternator and battery. Carefully disconnect the connectors, clean them and make sure they are re-attached securely. Check the wires as your track them. Make sure they are not frayed or otherwise damaged. Remove your battery cables. Clean them, check the connectors (this is probably where your problem lies) and make sure they are connected securely.

Posted on Jan 19, 2009

  • Chris Hall
    Chris Hall Jan 19, 2009

    You can also use a multi-meter to check voltage at the battery terminals (with the vehicle running). Then check the voltage at the battery connectors to ensure the reading is the same. The work your way to the back of the alternator posts. If you're checking the voltage along the way, you'll narrow the problem to a specific wire/area.


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I agree with 3mac on this. If the battery is good you may have a short or draw somewhere. Have one of these places check for one of these problems.

Posted on Jan 19, 2009


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