Odd AC Charging behaviour

[chriserx]

if that's the case, then it may be the battery. i'll have to get someone to check out its status

It's extremely tiny with an odd, harsh charging profile, your profile doesn't list the year truck but the older ones also had a 12v BMS issue.

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[chl]

Yes, sadly, the way the Ford BMS for the 12v battery works is not designed for longevity:

It does not top it off all the way to 100% on a regular basis;
when it charges the 12v it does not limit the current to a healthy level apparently which ends up damaging the battery over time (heat);
it allows the 12v battery SOC to get low which results in sulfates building up over time.

Here's some more info fyi:
-----
I keep my 12v battery on a trickle charger/battery maintainer with an AGM mode to avoid premature death (its, not mine) and to ensure OTAs get installed..

Deep discharge, which the lightning algorithm allows, is not good for longevity of these batteries, and the high charging currents seen when the battery is low, are another bad feature of the lightning system of 12v battery management.

This post form the Mach-e forum goes into depth about these 12v AGM batteries:

https://www.macheforum.com/site/threads/how-to-recondition-service-your-12v-battery.11069/


If the details about how AGM battery charging progresses are accurate, the truck will not, on it's own, top off the battery in many cases because of the time it takes. That makes a trickle charger even more important for longevity since it can be on the 12v battery for many hours at a time charging even when the truck HV is not.


And this one about the different ways to charge up the battery to get OTAs:

https://www.macheforum.com/site/threads/how-to-get-failed-otas-to-install.29749/

Also several threads here about putting trickle chargers on the battery and how to make it easier by adding a trickle charger wire:

https://www.f150lightningforum.com/forum/threads/charging-12v-battery.16979/

This is what I did (a fused SAE cord to the charge port from the battery):

 

[truthlesshunter]

It's extremely tiny with an odd, harsh charging profile, your profile doesn't list the year truck but the older ones also had a 12v BMS issue.

it's a 2022 so definitely would be in the affected years

 

[truthlesshunter]

Yes, sadly, the way the Ford BMS for the 12v battery works is not designed for longevity:

It does not top it off all the way to 100% on a regular basis;
when it charges the 12v it does not limit the current to a healthy level apparently which ends up damaging the battery over time (heat);
it allows the 12v battery SOC to get low which results in sulfates building up over time.

Here's some more info fyi:
-----
I keep my 12v battery on a trickle charger/battery maintainer with an AGM mode to avoid premature death (its, not mine) and to ensure OTAs get installed..

Deep discharge, which the lightning algorithm allows, is not good for longevity of these batteries, and the high charging currents seen when the battery is low, are another bad feature of the lightning system of 12v battery management.

This post form the Mach-e forum goes into depth about these 12v AGM batteries:

https://www.macheforum.com/site/threads/how-to-recondition-service-your-12v-battery.11069/


If the details about how AGM battery charging progresses are accurate, the truck will not, on it's own, top off the battery in many cases because of the time it takes. That makes a trickle charger even more important for longevity since it can be on the 12v battery for many hours at a time charging even when the truck HV is not.


And this one about the different ways to charge up the battery to get OTAs:

https://www.macheforum.com/site/threads/how-to-get-failed-otas-to-install.29749/

Also several threads here about putting trickle chargers on the battery and how to make it easier by adding a trickle charger wire:

https://www.f150lightningforum.com/forum/threads/charging-12v-battery.16979/

This is what I did (a fused SAE cord to the charge port from the battery):

super helpful...thanks. i'll have to keep this in mind as a possibility and safeguard

 

[ZSC100]

super helpful...thanks. i'll have to keep this in mind as a possibility and safeguard

Get an OBDLink adapter and CarScanner immediately. You can watch your 12V charging system and so many other things live and probably diagnose the issue yourself without even reading DTC's but also Read the DTC's and clear them with the same troubleshooting logic and if it's the truck you will know quickly.

I suspect it's something with your EVSEs, bad contacts somewhere, loose wires, etc. If it's anything outside the truck you likely won't be able to diagnose it with the truck. Let us know once you get CarScanner going and we'll tell you what PIDs to look at while attempting to charge.

 

[Adventureboy]

As mentioned, dealer didn't want to take it in because it started working again...

They can check the codes remotely. You don't even need to take the truck in for them to identify a problem. When I call my dealer about anything, that is the first thing my service advisor does and we talk from that point forward.

 

[Adventureboy]

In your case, if both EVSEs identified a Ground Fault (leakage to ground), it can be caused by the truck or by a wiring fault to the EVSE (I've seen errors caused on both sides with my truck). It appears to be the truck in your case since it throws the fault when you plug in and your other EVSE is fine. Intermittent faults like this are a b*tch to find so I understand the dealer's hesitation.

The 12V system can give you grief, but unless you've seen other symptoms, I doubt that is the issue. I certainly wouldn't rule it out. A quick voltage check on the 12v when you get the error would rule it out, but if the truck starts fine, it likely isn't that.

 

[bc1]

Just wondering how many stealership service advisors will get on the computer and check your codes without charging you for a service call or you actually being there for a warranty work or service call where they had you sign an authorization that may bind you to pay for something not covered by ford warranty? Somehow I don't think I'd have any luck if I made a cold call to one who didn't know me from Adam even if he could look it up and see someone with my name bot the truck there.

 

[Adventureboy]

Just wondering how many stealership service advisors will get on the computer and check your codes without charging you for a service call or you actually being there for a warranty work or service call where they had you sign an authorization that may bind you to pay for something not covered by ford warranty? Somehow I don't think I'd have any luck if I made a cold call to one who didn't know me from Adam even if he could look it up and see someone with my name bot the truck there.

I consider myself very lucky on this front. I've always known the codes it is throwing before I call. That way, I'm calling from a somewhat knowledgeable position - and I have a good relationship with the service rep ;-)

 

[TaxmanHog]

it's a 2022 so definitely would be in the affected years

Please also put the date in your Vehicles: description, having it there for future discussions helps a lot.

https://www.f150lightningforum.com/forum/account/account-details

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