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Charging system issue

Messages
2
Reactions
0
Points
1
Location
Missoula, MT
Vehicle
2021 Explorer ST
#1
Hello..major charging system/battery issues. I got “shutting down systems to preserve battery” warning in March. Checked and replaced the battery, alternator output was good, 3 months later “service charging system” siren went on with red flashing alert on the display. Dealer could find nothing wrong, battery and alternator output still both good. “Bring it back if it does it again” was their advice. Last week the “service charging system” warning came back and VERY rapidly a warning for EVERY system came on and the car completely died, no power at all. Dealer says one of the connectors on the battery block wasn’t tight enough. I was an ASE tech (but also human) and I don’t think I failed to tighten the connector AND the dealer had the car in July and should have checked it then too. I don’t think they know what to do, I’ve asked Ford for help as well. Any ideas?
 

OP
J
Messages
2
Reactions
0
Points
1
Location
Missoula, MT
Vehicle
2021 Explorer ST
Thread Starter #3
Yes, I did the manual reset myself, the dealer said they used the scanning device, reset the BMS and cleared all codes (which were old). Dealer also claimed 8 hours with windows open and doors closed would automatically reset the BMS. Therefore (theoretically) it was done 3 times .
 

Messages
337
Reactions
113
Points
37
Location
Desert South West
Vehicle
2023 Explorer ST
#4
In my humble opinion the alarms are based on the battery's state of charge (voltage) and nothing to do with the BMS sensor, I had to change my use of my 2023 ST to stop the warnings. I leave the vehicle running while parked waiting for someone or something (curb side pickups), and I also connect to a trickle changer when it will sit for more that 3 days. After that no preserve battery warnings.
 



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