Quote Originally Posted by kakashi09 View Post
When idle. The light brightness changes. As i turn off the aircon it turns normal. I just bought a new battery last week. I don't think its the battery. Could it be the headlights itself? It seems the engine can't carry the load when the aircon is turned on. It vibrates but if i step on the rev it seems fine but i can't always step on the rev right?
Maybe you can have your alternator checked. Your description of the symptoms is pointing towards that direction.