Originally Posted by SEACHASER1(FX4)
97f150f/s when you figure it out.let me know,,im having the exact same issue..cant do anything about it now cause im offshore,,but im taking it in when i get back...firstname.lastname@example.org..send the answer to that email thank you
This thread is about 8 years old, - -it's a good bet he figured it out.
For the 97/98, -Could be the MEGA Fuse 175amp or the inline mini fuse 15amp. The alts will have a high pitched whine when either fuse goes. BUT, you will get battery light illumination in either case.
Easiest way to check is to fire it up and poke a meter around. If everything is fine there. Remove the belt and fire it up. If you don't hear it, - it's a pulley, - most likely the idler. Could be the tensioner or the alts pulley as well.
NOTE: When you change the belt, - it's recommended to change the complete tensioner at the same time. Personally, I change both tensioner and idler pulley when servicing the belt in these vehicles. Although the idler pulley isn't recommended, - they fail just as much.