RV Repair: suburban furnace #NT45S 88 Winnabego, porcelain insulator, suburban furnace

Question
my furnace was opperating fine and had gone through several cycles after annual inspection when the high voltage wire popped off of the blade on the electrode while the unit was running. I moved the wire away from the furnace prior to shuttin it down and noted a slight shock. After it shut down I reconnected the wire and restarted the furnace. The fan came on and in 20 seconds I heard a click but there was no spark at the electrode. I checked the voltage at the blade when the click occurs and it shows only 10.8 volts. both batteries are fully charged. could this have damaged the modual board? What should the "high voltage" be? Thanks in advance for your thoughts.

Answer
GARY
THE WIRE YOU ARE REFERRING TO IS THE EQUIVALENT TO A SPARK PLUG WIRE. WHEN IT CAME OFF THE PLUG, IT COULD HAVE SHOCKED BACK TO THE BOARD AND DAMAGED IT BUT I DOUBT IT.
THERE IS A PORCELAIN INSULATOR ON THAT SPARK PROBE THAT MIGHT BE CRACKED. WHEN THAT HAPPENS THE SPARK WON'T GO WHERE IT IS SUPPOSED TO AND IT WON'T IGNITE THE GAS.
A DIRECT SPARK IGNITION BOARD WHEN HEALTHY,PUTS OUT A SPARK AT AROUND 15-25 THOUSAND VOLTS. THERE IS NOT MUCH CURRENT,SO IT WON'T KILL YOU JUST SHOCK THE STUFFINS OUT OF YOU.

THOM