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Your box is bad…24v for 9 seconds, after glow last 2mins, an S3 smart start sends a constant 5VDC for 2mins, previous start boxes pulsed 24volts for 2mins. If you have 24v after wait light? Your new plugs are now smoked.

replace the Nartron with KDS S3 and new plugs...end of problem

what you described is "after glow"...

they are talking about the obsolete green label EESS, I personally don't like that box. What I like about the S3 EESS is they did away with after glow, I hate the 2mins of On and off.

I that all the time...one issue is, don't forget to install the foam cushion seal on the top connector, that keeps the water out. I would seal up that area with silicon if you put in a new box as well as use the seal.

Just an FYI....a PCB is a PCB, an EESS is not a PCB. It crucial when diagnosing what's wrong when folks use the wrong terminology on these boxes...it is confusing, but it's a crucial piece of the pie. also, if you look at the old schematic of a PCB...not an EESS, it shows 6 items in the box. 1...