Yeah that is your problem. I run that amp for my base station and had to get a hot power supply. The only difference between men and boys is the price of their toys. OH the price we pay for having fun ! LOL Only meant in a joking way !A KL503. I know it draws because as I key up at idle, the idle drops. I guess with the headlights on at idle (stop and go traffic) the alternator doesn’t have enough amps.