Im having problems with my 1999 Sportage. Im running the AC and headlights and suddenly the Batt light and the brake light come on and the lights dim a little and the AC fan slows down. When the dummy lights turn off I get full power back to the accesories. It happens every few minutes day or night for the last 2 days. I thought it was a loose battery connection but those are all good. No CEL lights and the battery is charged cause the lights are good when the car is off and it starts right up. alternator problem? Any other connections,relays etc I can check?