Originally Posted by
pizzaguy
It would have to slip enough such that the alternator produced less than battery voltage, that is how the light works -and given that the alternator can charge at idle, I'd say the belt would need to be damn loose -seems to me the power steering and maybe even water pump would be effected.
I'd check the belt tension, but I'd also bet $20 that the alternator is just plain flaky.
You think that the belt drives the alternator up to 2,500 rpm, the belt starts to slip and you think the alternator then slows down and drops to such a low speed that the light comes on. I do not think that makes sense.