Most of the time, the high rpm alternator light is caused by very worn
brushes. The flexible wire leads to the brushes are probably at their
maximum length and the spring that normally keeps the brush in contact
with the armature can't reliably do so while also straining against the
short lease. The armature is not perfectly round and so it is like a
camshaft that is turning so fast that the valves start to float at high
rpm when the valve springs get tired. A new regulator/brush pack
assembly can be bought for under $20.

Mark

Christopher Gronski wrote:

>I am having an issue with my bettery and oil pressure lights.
>
>My battery light will come on while I am driving along, but will shut
>off again depending on engine revs. The odd thing is that the light
>will come on at high revs, which I'd assume would be optimal for
>charging. Any thoughts?
>
>Problem two is my oild pressure light that apparently comes on for no
>reason. This often occurs if I back off the throttle or can also occur
>right after a pothole. Any ideas?
>
>Thanks,
>Chris
>
>P.S. This is my third post today, clearly I have entered summer vacation mode...
>
>
>