A friend of mine told me about this same spark box he had. He is a TV man. He removed the cover and soldered the GND terminal inside that had worked itself loose. Later I found out a lot of these had a similar prob. So before ya spend any big money play around with these suggestions.
The Furnace stopped working at exactly 10:00PM PST Yesterday. So I get a call in the morning.. saying we need heat.. its doing the same
thing again trying to re-light and cycling over and over.
Well I went over there with my Soldering Iron and some electronic silver solder. Having a background in electronics.. I decided to take
JWWebster advice which didn't hurt to look at and try. I removed the Honeywell module and took it apart (PICTURES) and found a bad
solder joint. It was the one connected to one of the relays.. traced it back to the PV/MV Relay. Soldered that as well as all the key
points including the ground. Re-installed the ignition module and wires.. put an extra ground to the chassis so this time for sure it will
be solid. Worked great.. fired right up again. Better than new being that its OE and all solder joints on board have been re-soldered.
Spark was even better than before.. so ya! Thank you again for suggesting that Webster (YOU THE MAN).
Hopefully with enough of these fixes.. I can become a Tech on the forums too. (High Hopes)
Don't you guys just love these pics