breeves002
Well-Known Member
- First Name
- Sam
- Joined
- Feb 21, 2021
- Threads
- 90
- Messages
- 1,734
- Reaction score
- 3,593
- Location
- St. Louis, MO
- Vehicles
- 2021 Mach-E GT PE
Connecting L2 is a terrible idea. For module updates it takes that CAN bus offline but leaves power enabled which would cause a whole bunch of stuff to freak out and the charging to stop. Depending on the module updated the DC DC converter sometimes stays online, other times it does not. It does not stay online when updating the main powertrain related modules or the IPMA. The IPMA update requires a 30A+ charger or you'll kill the 12v battery during it.yesterday, I had periods of 12V 36A draw from the external power supply. Today, the highest current was 24A. 10A might work, or at least extend the time to low 12V LVB, but ideally, we probably want a 50A minimum charger/power supply to cover all bases, especially if FDRS sessions go for hours.
That said, my dealer was updating my MME for some hours before I noticed they had no charger connected, and everything was still okay. I bet many dealer updates are done with no power supply connected. Or, the dealer might connect L2, which some TSB/SSM say is not the same thing, and not recommended in lieu of a 12V charger/power supply (or, a Red Mustang!).
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