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This is probably due to a faulty wiring, regulator/rectifier or, less likely faulty alternator
1st check the wiring & connections from the alternator to the reg/rect (3 yellows) then check wiring to the battery (thick red)
You should get 13.5 volts (with a fully charged battery) across the battery terminals rising with the engine revs to no more than 15.5 volts, if its over then the regulator is at fault
check the alternator for continuity between the 3 yellow wires (3 pairs) at the reg/rect plug after disconnecting it. the 3 pairs should have a similar reading & none should go to earth
To check the rectifier part you need a diode drop setting on your multimeter. there should be a reading 1 way only between the red & any yellow and between the black & any yellow if not it will need renewing
Hope this helps
Please mark as helpful if it has been
Put the battery in backwards? test light says theres power the charger will show a wide open battery this open (hollow) to be fully charged and it'll be bad and then if put in backwards the main fuse may be blown