Battery issue, Charging issue or BMS issue?

[Willie DEE]

some battery chargers have a "desulfate" option - is there any legitimacy to desulfating a battery.

 

[gdflynn1]

Several threads out there but figured I would post here. Woke up today and my '21 has, yet again, a dead battery. This is the 3rd battery in 23k miles. (original + 2 replacements since then). Ford Mobile tech coming today so going to try to challenge them to check the electrical see if they can find anything. Not sure if i have the dreaded parasitic drain or its these Ford batteries. Today was also the first time that even though the battery is dead, i have the loud thumping repeating through the entire sound system (its still going as we speak). @FordTechOne : Have you ever seen/commented on anything like this? Was looking for any posts you may have had something to say as your feedback is always appreciated.

 

[EricM]

Again- I'd try unplugging the BMS sensor and see how it goes for a while. There are no downsides other than auto start stop might not work.

 

[FordTechOne]

Several threads out there but figured I would post here. Woke up today and my '21 has, yet again, a dead battery. This is the 3rd battery in 23k miles. (original + 2 replacements since then). Ford Mobile tech coming today so going to try to challenge them to check the electrical see if they can find anything. Not sure if i have the dreaded parasitic drain or its these Ford batteries. Today was also the first time that even though the battery is dead, i have the loud thumping repeating through the entire sound system (its still going as we speak). @FordTechOne : Have you ever seen/commented on anything like this? Was looking for any posts you may have had something to say as your feedback is always appreciated.

It sounds like you definitely have a battery draw. The mobile technician should bring an ammeter to verify that before replacing the battery again. Obviously continuing to replace batteries is not fixing anything, something is causing them to discharge.

 

[gdflynn1]

It sounds like you definitely have a battery draw. The mobile technician should bring an ammeter to verify that before replacing the battery again. Obviously continuing to replace batteries is not fixing anything, something is causing them to discharge.

@FordTechOne : thanks for the quick reply. The mobile tech did a lot of tests. Ultimately, ran out of things to troubleshoot without being in the shop. So he wants me to bring it in for a full day so he can work on it there and run parasitic draw testing (pulling fuses, checking grounds, etc. etc..) Got my 4th battery in though! Will let everyone know if they are able to detect the source of the draw once I get it into shop.

 

[gdflynn1]

@FordTechOne : truck finally in shop. Heard back today that they seemed to have isolated the power draw to the guage cluster. That was kind of surprising. So now they want to see which specific area within the gauge cluster may be causing the issue. Said it could be as simple as a software update but not sure yet. Anyway, progress I suppose. Will post final remedy once resolved

 

[gdflynn1]

@FordTechOne : truck finally in shop. Heard back today that they seemed to have isolated the power draw to the guage cluster. That was kind of surprising. So now they want to see which specific area within the gauge cluster may be causing the issue. Said it could be as simple as a software update but not sure yet. Anyway, progress I suppose. Will post final remedy once resolved

Update: dealer has passed all info to Ford Engineering, who in turn told service to perform a TSB and some other things. Didnt fix issue. New instrument panel ordered. Takes 1 week to arrive, truck cannot move while waiting. FML. LOL

 

[gdflynn1]

Update: dealer has passed all info to Ford Engineering, who in turn told service to perform a TSB and some other things. Didnt fix issue. New instrument panel ordered. Takes 1 week to arrive, truck cannot move while waiting. FML. LOL

Instrument cluster actually arrived today. Replaced it, but still seeing the draw. Ford is now sending out a corporate engineer rep with different tools to help troubleshoot. This is so much fun. FML , lol