Which part?

on one of my burners the small red light that is on when the surface is hot stays on all of the time. do i need to buy the entire burner assy or is there another part that will fix this problem

Here are your parts
Replacement parts for Jenn-Air JES9800AAB RANGE- S/C S/I DDRAFT ELE | AppliancePartsPros.com

I could not find a wiring diagram for a JES9800AAB the attached is for a JES9800BAB. Hopefully it is a close match to yours.

Looks like you have to buy the complete element but I would check with the parts people just to be sure.
JES9800.pdf (823.7 KB)