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On my last trip I noticed that diesel was not firing.  Had recently replaced the nozzle as I had not been running it often enough in the off season.  It worked fine prior to nozzle and after.  When I flip the switch the unit comes on but then does not fire.  After a little trouble shooting with Rudy he thought was a failed brain, but that was not it.  I'm assuming now that we know it's not the brain that the next thing to check would be that the igniter firing?

If yes, how does one go about testing that?