depends if the car is running or not. my stock alt charges at 13.8 //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gifwell if it was at 12.8 before playing music than you might want to check your alt. on a 12volt system it should read 14.4 while vehicle is running
That’s great and all but I would be more concerned about what my voltage is under load.It rest at 14.1 with no music playing with the car on