Question about 2002 Chevrolet TrailBlazer

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My 2002 trailblazer shut down, and would not start back up. I thought it may be the battery, so I jump started it. It started, I drove up the road, and all the gauges stopped working, again the truck stalled. I had the alternator tested, while in the truck, started, and failed. I pulled the alternator out, and had it tested, and it passed. I re-installed the alternator, charged the battery, and it started just fine. While started, I had the alternator tested again, and it failed. The trailblazer is pulling all power from the battery, and not the alternator. I'm wondering, what could be the problem?

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Alttenator may be weak, Try starting truck and remove battery 'Positive " cable with egine running. when you remove the cable it will die if alt not putting out enough voltage.

Posted on Mar 23, 2011

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The alternator needs to be tested under load. I believe though that the problem is with a bad electrical connection. Remove the electrical connections at the battery, alternator, and starter and clean them thoroughly. Re-connect the connections. Also check the grounding strap from the engine to the frame. Check the strap itself to make sure it is intact and check the connections for bolt tightness.

Posted on Mar 23, 2011

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