Mike, you were right after all. Three of the burners have a single coil, but the right-rear one has three, each with its own electrical connections  . Selecting 4 on the "coil select" switch powers the inner coil, 6 powers that and the middle one, and 8 powers all three. I guess it's a warming setup, though the burners are so powerful that even the inner one would overcook in a short while.
I missed this the first time around 'cause I get around in a wheelchair & inspecting the back burners is a stretch. - eda |