I got lucky and hit it on the front with a deadblow hammer and the volt gauge jumped up and it now shows its charging to like 15-16 volts. When I turn accessories on (heat, stereo, etc.) it'll drop down closer to 14, but it reads high now. Do I need to replace this thing, or will it be ok this way. My dad is from the old school and he said bad voltage regulators do that, but he meant with generators on old cars...any suggestions?