Both burners come on with dual burner element

Oven Repair (including Ranges and Cooktops)
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1

I have a Kitchen Aid cooktop, model KECC502GBL0. It has 5 burners, three single element, and two dual elements. The back right burner is a dual burner with a switch that has "Single" and "Dual" positions. No matter what setting I use, both burners come on all the time, and stay on "High". Occasionally, the burners will not go off when the switch is turned off, and I have to jiggle the switch a little to get the burners to turn off. I looked up the parts list on this site, but can’t tell which switch to use. I have not pulled the old switch out of the cooktop yet, so can’t see what the part number is.

3

Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=KECC502GBL0

I think the part you need is AP3672660 but check with AppliancePartsPros when ordering.

Also this may help with the install
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/73a244d6c58b438085256a8c005b310a/$FILE/4317269.pdf