headlight problem

The ammeter gauge is the gauge that shows the charging level. Should be on your dash cluster. Not sure of what model you are driving. You will need to pull the cluster out to get to the wires. It is the gauge with the two thick wires coming into one side and out the other on two separate posts. One wire should be red and the other black. If it is the Duster in your Avatar, it will be the small round gauge furthest over to the left of the steering wheel on the cluster.