Hi Jetcare. I appreciate the help.
No, it didn't light correctly after checking the spark gap.
The gap between the electrodes appears to be correct, 1/8".
The heater isn't at my home. I will be where it is tomorrow.
The service manual that I found shows the electrode at .356 from the center of the tube and .531" from the electrode to the end of the tube. I'll check these tomorrow.
I also need to verify the 12v connections. The last time I tried it I noticed that the light isn't coming on at all during ignition.
Observing the bang is a tad dangerous. :) I can video it, zoomed from a distance. Better to rely on video than my memory anyway.
Thanks