I have an 81 Eagle SX4. Yesterday on my way home the alternator idiot light came on. I pulled the Positive cable with the engine running and the alternator is still charging. I notice that when the engine idles really slow to the point of stalling the light goes out. When I turn the key to start the Car the ALT is out. after the engine starts the ALT light comes on. Any Idea on what would cause the aLT light to reverse itself. Thanks Bryan