I dropped my z125 about a week ago doing a wheelie. I was going less than 10mph and it didn't really hit the ground that hard. It was fine for a little bit, but then I noticed a weird noise that I don't really know how to describe, but it sounded like it was coming from the airbox area. The noise only happened around 3-5k rpm. While I was riding home, the battery light came on and when I got home and turned the bike off, the headlight would not turn off right away. It went off on its own about 2mins later. Then it wouldn't start at all. I checked the battery connections and fuses and they were fine. I have replaced the battery now and that doesn't seem to be the issue. I think its definitely something with the charging system. With the new battery, I can get the bike to start but the battery light comes on pretty quickly. After I take the key out the headlight stays on until I pull the fuse for the regulator. Is there anything I can check on the regulator or should I just replace it. Also I kinda got a video of the noise, but it's a little hard to hear. You can sort of hear it when the revs are dropping. It's a lot easier to hear in person. Any ideas or suggestions are much appreciated. Thanks in advance.