big deal, do it yourself for like $100 or however much your alternator costs. i swapped alternators out like 10 times, its a 30 minute job. your battery posts should've been cleaned anyway, you probably killed your battery and destroyed the alternator with dirty posts and bad ground wiring. get it all fresh and cleaned up and a new battery and keep up maintenance on it, your alternator isnt meant to constantly charge a crappy battery, you'll kill it fast