the battery is fully charged but the battery light stays on what would causethis on 1998 Chevrolet Venture

is it a bad connection on battery or a bad alternator?

Asked by for the 1998 Chevrolet Venture
load test battery and check charging system
Battery load test is good. so its the alternator right?
check charging system should be charging between 13.8 and 14.2v also check for power at alternator