Front right side burner, the small burner heats up but the bigger burner does not. Also one of the leading to it from harness is blackened. should I replace both burner and harness.
Yes, with the element being out and the harness being blackened it would be a good idea to replace both. The harness may be ok for now but the damage could still be there with a weak wire.
Is part 12001857, the complete top assembly or is it just the glass top?
Answer Hello John,
The part you are looking at 12001857 is the main top assembly which includes the glass with brackets to attach the elements and the glass assembly to the top of the cooktop. The picture shows all that is included.
Which 6" Burner AP4008687 or AP4012913
Answer Roger, the correct 6" element for your range, based on the model and serial number you supplied is 12500039. Your guess was pretty accurate. Thanks and Good Luck