so I just recently changed my 2003 stock alternator with a duralast gold altenator and when i roll my windows down or have my 400watt amp going in the car i get a voltage drop from 14 volts to 12.6-13 volts then it goes back up to 14volts. It doesnt happen all the time but it’s starting to do it more. I checked all grounds from starter, alternator, and any visible grounds i can see and everything seems fine. I did notice one of the kicker gauged wires I have to going to my positive terminal on my battery has a couple frayed wire pieces. I went to check my battery with a DC volt meter and the readings are 12.7 volts when off and unplugged. So I even bought a quick battery just to try it out and even with the new battery I got a voltage drop! Is it that frayed Kicker gauged cable that could be causing my voltage drop or does anyone have any idea of what it could be? I hate electrical issues for this reason. I don’t like other people working on my car because it will cost me money and I would rather know the work is getting done properly and with the most care. Any suggestions will help ALSO my car has a safety recall for a fuel hose so I doubt that could be part of it, just had to throw that out there