They are sealed burners but the wire connects to the recepticle they snap into isn't sealed. You probably damaged the wires or recepticle with the ammonia. Check the 2 prongs on the recepticle to see if they are loose or damaged. You may have to consult a repair place.

A more sensible way to use ammonia on the enamel is to soak a cloth and let it sit for a while over the stain. This cuts down on the amount of amonia you have to use and keeps the stain wet so it loosens.

Frankly I never had to use anything like that and I've canned lots. If you wipe up the spills every time you can something it doesn't get burnt on.

I don't know what happened to your stovetop; but I've found a way to clean my sealed gas range top that works great for me. I spray Charlie's Soap all-purpose liquid cleaner onto the greasy, cooked-on areas. Let it sit just a minute or so as necessary. Then wipe/rinse with a wet rag. You'll find that the gunk lifts right before your eyes. I cleaned mine this morning. It was pretty band and needed an extra spray and I also used my Sonic Scrubber with the scrub pad attachments (that electric toothbrush-like tool). You can put the removable stovetop pieces in the sink and do the same thing, rinsing under the tap. If you use the Sonic Scrubbers on the sealed portion of the cook top, you will create a liquid/foam -- but just use your rag in the other hand to catch excess as you clean. It's easy to do, therefore I tend to do it more often.
I hope your stove problem is easily resolved.
Annie1971