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When I opened mine up and saw the condensation, it was right after some rain and colder temps. It's a sealed metal box. FYI-There is a patent document, pointed out by another guy on the site, that shows where holes could go--https://www.google.com/patents/US6148258. This patent document...

Not a bad idea. From what I've seen, the HMMWV is very well waterproofed. With the right equipment (deep fording), I've seen pics of folks in deep water with these things. I hadn't thought of the desiccant.

Good thought. The main concern is to protect the connections. The backside of my Printed Circuit Board (PCB) was even corroded in some spots (I've got pics). I"m thinking a light coating, in general, is going to be much better than what there was.

Thanks for the info ryanruck. I'll check out the DeoxIT and Konform you mentioned. The S3 should be easy enough to remove and open up. My EESS had condensation build up inside that lead to corrosion. I would hate to see anyone have problems with a pricey S3 box. I'm seriously thinking about...

Jakob1944, I've run across the link you shared. Thanks for your interest in the topic. With folks like myself buying HMMWV's from Govplanet, this will likely be a common problem. I've spent way too much time researching the EESS and troubleshooting. I'm hoping that my input helps others. If my...

I agree with your concerns. I'm currently looking for a good coating to keep it from rusting and corroding again. I replaced all the rusted hardware at the connections and sprayed the board a few times with WD40. I also ordered a new relay and have the unit reinstalled without the cover on. I...

Nartron Yellow label EESS body connector pinout I agree with sealing up in the top connector. Mine had the foam donut on top to prevent this, but it didn't work I guess. Once I'm done cleaning up the connections, I'm contemplating drilling some holes in the bottom of the case for moisture to...

We recently had a few days of rain and I just went out to start my 1991 M998 Humvee and now my wait to start light is blinking. Now it doesn't start. I have a Nartron Yellow label EESS box-19207, 12469158-1. I've been reading a lot about the EESS issues and how folks are going with the S3...

Z1classic, did you ever solve your problem with your bad EESS. I have a similar problem. My alternator does not charge either and my wait to start light stays on. Glow plugs are still ok.