I had an engine whine before but then i fixed it, ended up getting a second battery and rewired my entire system and its back, i checked my amps and stereo, power and signal wires are ran separately, i have a feeling its the stereo because ive had it for years and it was also doing it in my last car, just looking for some help and see what kind of suggestions you guys have to help fix it, ill try checking again with whatever advice yall give