If the alternator or connection is bad it may have already weakened the new battery beyond recharging properly. You need to test the alternator properly and check the voltage on the battery. If you replaced the battery for a reason then you had a problem you didn't realize in the first place. Check the interior to make sure no lights are staying on and draining it. Did you do anything with an alarm or radio recently?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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