I had the 74-260z out the other day at night. Headlights as well as radio and heater fan on. I had to make a turn and put the blinker on and the headlights and dash lights started dimming with each blink of the turn signal, the amp gauge also dropped with every blink and the tach gauge also dropped with every blink. Is this normal or do I have an issue with something. I know the electrical system in these cars does not produce much surplus power so is this normal.