Alright! Now we are getting somewhere. Yes first thing I would check the ground. Is it just a self tapping screw into metal? Or grounded under a bolt? Is it bare metal on metal contact like it should be? Is the wire connected good into each terminal? Try moving the ground to a seat bolt or something.
Amp will protect with bad ground so fix that. Should still work fine. Its a sony radio right? I have heard that sound from them. Just a shutdown sound. I believe you can turn it off in the settings somewhere
Amp will protect with bad ground so fix that. Should still work fine. Its a sony radio right? I have heard that sound from them. Just a shutdown sound. I believe you can turn it off in the settings somewhere