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the simplest way I tell folks is, “the only thing for certain on a hmmwv is everything is uncertain” model years vs SN range accessories unit markings MWO’s mods armor The list goes on, 4 of those are driven at the unit level, meaning local Cmdr authorized.

my point was people posting model year as if that had a bearing on what PCB,EESS or Smart start they might have in the truck, even your “yellow label” does say which Mfg you have, Your observations are based on ? One truck you own or owned? Mine are based on trucks arriving every day into the...

Model year of your truck means Absolutely nothing as the model year doesn’t mean you have an S3 EESS installed. older trucks have old PCB’s and yellow label KDS and Nartron boxes….99% of M1123’s have Yellow Nartron EESS. newer turbo trucks have been consistently running S3, as they should.

This has been covered a hundred thousand times…but here goes. All boxes prior to S3 EESS pulse 24v for 2mins after start up, upon the introduction of the S3 EESS, it is now a constant 5 vdc for 2min, not observable on the voltage gauge.