That's the point...
The EHC, if it sees something grounded ever so slightly, even shorted with moisture, it will shut down the EHC, or a portion of the EHC and you get stranded. It may take you a while, but there is probably a short somewhere.
That is the ENTIRE reason to replace the EHC. With the Wire-Plus module, it runs off full 12 volts, not the 3 volts, 5 volts crap that the EHC does. If there is a water short, or a ever so slight short, the bike will always start and run. And more than likely everything will still work on the bike except for the single item that is shorted, like a turn signal or the horn or speedo.
So, look for your problem, but it is a sure thing, it will do it again and strand you. It did me about 6-8 times.