Any DTC"S - diagnostic trouble codes ? The charging system on that vehicle is computer controlled .
Are You Smarter Than Smart Charging System MOTOR
SOURCE: Charging system
change your battery cables and check all wires on the alternator for loose connections, expecially the grounds.
SOURCE: alternator putting out 16.5volts
or and more likely... the voltage regulator either mounted on the alternator or on the wheel well is defective.
SOURCE: 2004 chev silverado Z71 1500 4wd
That was a good suggestion by Molson. Also, if you have been doing a lot of heavy hauling, have them check the strainer, which could be a problem as well.
SOURCE: battery test proper voltage, new alternator test
If you test battery with a load test it will probably fail. Battery is bad. Also have alternator tested. Go to any parts store, even walmart they all test for free. I would put my money on bad battery. Cells getting weak.
SOURCE: 2004 chevy silverado 1500 4 wheel drive wont work..
try selecting from nutreul or less then 3km
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