I was about 4 blocks from my house and heard a rattling noise under the hood.
Turned the corner and it died. Opened the hood and the serpentine belt looks like it jumped over one track and split about 1/8 in. off the edge. This frayed edge looks like it took out the top blade of the crank sensor.
Pulled it home and it got dark out so I can't check it out.
Anyone know why the belt would do this and how hard is the crank sensor to align?
I have the short bypass belt on it because a few years ago my AC compressor bearing went out and with the leak in the system it wasn't worth replacing.

Don't know. How'* the tensioner feel?

don't know either its dark out. The belt did still have tension on it though. Just moved over one notch and cut off the edge.
But I did notice the tensioner plastic wheel has some grooves worn into it.
Its been this way for a while.
Also I need to find an A/C compressor and get rid of the bypass belt.
Anyone have one?

OK I just tore it down. Heres what happened.
Auto Zone water pump bearing went.
Took out belt which took out crank sensor = died on road.
Yeah I'm Pi$$ed. They should have made a guard for the sensor.

OK the SSE is back to life.
After changing the crank sensor I decided to index the crank blade for blade just to see if everything was ok.
Boy I'm glad I did. One tooth was bent out 3/16 in and would have taken out the new sensor had I started the car.
Took a while to tweak / bend back into place (PITA).
Then I went out to the yard and got a compressor so I could run the proper belt.
Boy what a PITA to line up the upper bolt on the AC compressor.
almost lost it until a neighbor came over to help.