I know when the volume is to high for my electrical.the volts drop.I just wanted to see how loud it went on my electrical and that it works because its gonna sit untill I get better electrical and if u stop a car the alternate does not put out as many amps so that means i have to play it lower.plus my car idles low so by turning it up at a stop it worse .stopping a car doesn't mean its off.so when u stop at a stop sign u shut ur car off?