[Big-E]

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?

 

[Big-E]

UPDATE: It turns out it was the alternator that was bad. We hooked it up to the machine and the needle was all over the place. it was dipping down to 12volts,running off straight battery, then shot up to 14v then sat at 12 for about 30 seconds. I replaced the alternator and the problem is fixed.