tl;dr: this is not a charger (it's a DC-DC Converter), and it's GEN2 (ie 2014-on).
A couple of things:
To be accurate, 1028665-00-B is not a GEN1 Model S DC-DC Converter. It's not even a "charger", as the title of this thread (used to) say (it's now been updated).
GEN1 DC-DC Converter
The Model S was introduced with the 6009170-00-J, which doubled duty as the original Front HVJB. It contained fuses for the cabin heater, the battery coolant heater, and the air conditioning compressor. Many times on those early cars one or more of those fuses would fail (due to problems with the systems they protected) and the fuses were not deemed serviceable; the entire DC-DC Converter had to be replaced. Expensive. This unit was in use from the SOP (start of production) in 2012, through at least the end of 2013. It was located just behind the right front fender liner, bolted to the "firewall". On the Tesla, it got wet and had connector corrosion issues in come areas. The aftermarket takes this unit apart and replaces the fuses (saving around $2500), and there are YT vids on how to DIY.
In this thread, so far only muehlpower is using GEN1; all others appear to be working with GEN2 DC-DC Converters.
GEN2 DC-DC Converter
1028665-00-B is a GEN2 DC-DC Converter, and from memory it was first installed about Jan2014. It moved the fuses for accessories out into the new-for-Model-S Front HVJB, where the fuses could be serviced without replacing an entire module. It is located between the back of the frunk and the "firewall".
Many, MANY eBay and elsewhere listings incorrectly assume that HV parts are all the same from 2012-2015 or 2016, but there were a lot of improvements and changes along the way, and a LOT of ads selling this stuff have the years wrong.