The Gen1 chargers are not known to be the most reliable. Sounds like a problem in the PFC stage. They are not very serviceable even if you can do board-level repair due to their mechanical design. I suggest just ordering a used one for a couple hundred $.
If you wanted to save buying one, you could convert the existing slave to a master, and move it to the passenger side, and remove the master (so you'd be down to 40A max charging), but this requires some hassle including altering the config so the car doesn't look for the 2nd slave charger. It's also possible to upgrade to the Gen2 charger, but it would require also replacing the HV junction box that contains the DCFC contactors and some harnessing. On Mon, Jul 15, 2024 at 11:26 PM Cor van de Water via EV <ev@lists.evdl.org> wrote: > Hoping to find someone that has experience with the early Tesla model S and > X 40A onboard charger. > My S85 actually has 2, having the ability to take up to 80A, up to 20kW > level 2 charging speed. > But, recently it refuses to charge: everything seems ok when plugging in, > but after half a minute the car ramps the current up, as soon as it even > steps to 1 Amp, it fails with warning: "charging slowed - poor grid power > quality possible. Try different charging location. > > Well, no problem with the charging location, I have read that this is > likely a problem in the charger or the circuit feeding the AC to the > charger. > Before I rip my rear seat out to get to the dual chargers, I hope someone > has seen this behavior before and can give me a heads up what to expect. > Preferably I have materials for repair at hand and do not need to leave the > car ripped apart for too long, it is in a public location. > I do have the service manual, but that just tells how to remove the onboard > chargers, not how to repair them, though I am comfortable troubleshooting > and soldering... > Cor. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20240715/12915e2c/attachment.htm > > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20240715/412416fa/attachment.htm> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
