ITEM NAME:12V Car Battery and Alternator Tester - Test Battery and Alternat Y1S8 12V Car Battery and Alternator Tester - Test Battery.These lights would indicate if alternator works well. Alternator state - accelerate the engine to 2000 rpm, when the green light is on, the charging status is ready. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.
