So, I put in a new alternator 2 weeks ago. The first one got fried and the second one is fu*ked up also. The volt gauge goes up and down. I hooked it up to a AVR machine at my job and it was showing 13+ volts. Then, on the way home, it started to get fu*ked up. On my block, the gauges died then came back on. Do I need a new battery? Im sick of trying to fix things and being stuck with a broken car!