Alternator intermittently charging after 323,000 miles.

[trini_per4mance]

ok, so after doing 323,000 miles on my yaris, my alternator light on my dash kept coming on intermittently while cruising at 3000rpm. but once i put the car into neutral and rev it to 6500rpm, the light will go off and come back on sometimes after a couple minutes or sometimes after a couple hours. it varied. so, i got a used alternator from miami off an 08 yaris doing only 7000 miles for $75. the alternator looks brand new. so, i new i couldn't go wrong. i swapped it out and now the problem is gone.

this is the first part that i've ever changed on the engine, apart from regular maintenance parts.