Rav4 alternator replaced, now no high bearms?

check all the fuses and relays associated with the lights. It could also be the bulbs, unusual though that they both would quit. check for 12 volts where you plug in the light bulbs. While it has nothing to do with the alternator, its not impossible something got unplugged or a fuse got blown when the work was done.

I have a Rav4 that randomly overcharges. The alternator ends up charging at close to 29 volts. The daytime running lights use the high beam filament. When this happens, I get the same initial symptoms that you had. In addition, it will blow the high beams if using the daytime running lights, run your blower motor crazy fast, kill most phone chargers plugged in the cigarette lighter, and make your wipers swipe like crazy. It will also throw a code for a bad wheel sensor. I have tried a lot of things, but the randomness is annoying. The dashboard fault lights will stay on for the next 3 trips of several miles in the car. Stopping and starting the engine fixes the charging problem, but the headlights and your phone charger are already bad. I'm still looking for an answer. So after my long dramatic story, yes an alternator overcharging crazy can wipe out your high beams. I have not had it damage my low beams.