I'll fix anything that runs on 12 volts
seth Alvo posted an answer for this Stingpro ST444 1850 Watts Complete Amplifier 4 Gauge Hookup Kit Car Audio Amplifier:
"I'm afraid you must go to the back of the headunit... your only other option would be to..."
seth Alvo posted an answer for this Crunch BlackMaxx BMX2250 2 Ch 1000W Amp Car Audio Amplifier:
"The red light means the amp is in protection mode. A few things can cause protection..."