what is this on my alt?

[kaiyara]

cant help you with the light and the lighter but i can tell you to check the sending unit wiring harness to make sure its good and you can also check the sending unit to see if the float is good and sending a good signal. I am not sure on the ohms readings from full to empty but i know it changes when you move the float. it sounds to me like the sending unit might be bad and not sending the right signal to the gauge. I only know this because i had it happen to me in another car. not sure if its the same on the chevelle