Wyatt Faickney

i just got the alternator rebuilt the guy said he tested it(came very highly recommended), i picked it up and installed it, went for a drive this morning to charge the battery and it was dying. all the dash lights came on below 2000rpm and it was very sluggish. but after 2000rpms they went away but the electronics (like windshield wipers, tacs) wouldn't work and the battery wasn't really charging so. i think its the battery? i just dropped them off to get tested and maybe get new ones if they are bad
any other ideas ?

RAD4Runner

Pls keep on same thread as original to make it easier for people to help.