This is a bit embarassing. The coil has 3 metal prongs on the bottom. Small beige wires are attached to two of the prongs, nothing to the 3rd prong. The small metal leader from one of the wires attached to the coil was dirty and appeared loose. Cleaned it and slipped it back on---instant fire and ignition. Why didn't I check such a simple goofy thing first. Sorry to take up everybody's time on this.