Any help with 03 Dodge Neon SXT (details included)?

I bought a 2003 Dodge Neon SXT 2.0 ltr. engine with a little over 63,000 miles on it (no warranty). And when it comes time to turn on the headlights I notice dimming of the dash lights and headlights when useing the power windows and back defroster. The car's engine belt also makes noise when activating the rear defrost. Any other tips and help would be great as well.