12 volt power port issue

[Diligenthunter]

Morning All,

Had my front diff and transmission replace under warranty about 2 weeks ago, got my truck back and the 12 volt outlet wasn’t working. Truck was sitting for under 2 weeks assuming they did not put the battery system on any type of charger.

Checked fuses all good there, truck is not displaying any low power type messages.

Currently the port is working intermittently, does anyone know if the ports function is based on battery state of charge?

Truck is a 2022 power boost 85k miles on original battery.

Again truck has no messages about low power mode.

I do plan on replacing the battery’s but I would like to see if that’s actually the issue or if something else is going on.

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[tsigwing]

sounds like a loose connector. When the truck is running, there should not be any low voltage issues.

 

[Diligenthunter]

I’m fairly certain is not a loose connection, it’s gotta be something with fords bms. I just hate that I can’t find any proof or documentation on this. If low power mode popped up it would make sense to me.

 

[Tired Lizard]

Power Point Relay inside BJB feeds the fuses for 12V outlets.

Battery Load Shedding (from couple different Ford manuals)

Vehicles built before 2025 have a partial load shed strategy.
Vehicles built after 2025 contain the full load shed strategy.

The BCM is the primary module that is responsible for controlling the load management strategy.
The BCM processes measurements of the system and uses the information for calculations and load prioritization.
The strategy allows drain to occur from the battery.

Load Management minimizes the drain by controlling the time and magnitude of the drain that can occur.
The battery drain changes depending on the driving cycle and the types of loads the driver has activated, therefore, the BCM must be able to shut down or reduce the loads if necessary.
The intent of the initial load shed stage, LSHED1, is to reduce electrical loads in a manner that is not noticed by the vehicle operator.
During LSHED1, requests are sent in a prioritized order for the appropriate modules to begin shedding available loads.
In order to prevent customer satisfaction issues, the loads are requested to reduce power consumption with minimum impact to the customer.

The second load shed event, LSHED2, occurs in two stages, SHED2_TRANS and SHED2_CONTIN.
During operation of a vehicle equipped with large transient loads, there are transient peaks for current draw.
The Load Management algorithm reacts to these spikes by using the SHED2_TRANS state.
This state requires all non-critical loads to shed immediately, without customer indication, so that large transient loads can operate normally with little to no adverse impact to the
customer.

SHED2_CONTIN is a continuous deactivation of the loads to ensure the vehicle is able to re-start once the ignition is turned off.
During SHED2_CONTIN, a message is displayed to the vehicle operator notifying them of the vehicle's charging system status.
Independent of load shed requests, the Load Management control can request boosts to the engine idle speed.
Boosting the engine idle speed allows for increased output of the alternator to deliver more current to the battery.
Idle speed increases are done through network IBoost messages.

Load Shed Charts
The load shed charts provide a general overview of the features available on the vehicle based on the build options.

 

[Diligenthunter]

Power Point Relay inside BJB feeds the fuses for 12V outlets.

Battery Load Shedding (from couple different Ford manuals)

Vehicles built before 2025 have a partial load shed strategy.
Vehicles built after 2025 contain the full load shed strategy.

The BCM is the primary module that is responsible for controlling the load management strategy.
The BCM processes measurements of the system and uses the information for calculations and load prioritization.
The strategy allows drain to occur from the battery.

Load Management minimizes the drain by controlling the time and magnitude of the drain that can occur.
The battery drain changes depending on the driving cycle and the types of loads the driver has activated, therefore, the BCM must be able to shut down or reduce the loads if necessary.
The intent of the initial load shed stage, LSHED1, is to reduce electrical loads in a manner that is not noticed by the vehicle operator.
During LSHED1, requests are sent in a prioritized order for the appropriate modules to begin shedding available loads.
In order to prevent customer satisfaction issues, the loads are requested to reduce power consumption with minimum impact to the customer.

The second load shed event, LSHED2, occurs in two stages, SHED2_TRANS and SHED2_CONTIN.
During operation of a vehicle equipped with large transient loads, there are transient peaks for current draw.
The Load Management algorithm reacts to these spikes by using the SHED2_TRANS state.
This state requires all non-critical loads to shed immediately, without customer indication, so that large transient loads can operate normally with little to no adverse impact to the
customer.

SHED2_CONTIN is a continuous deactivation of the loads to ensure the vehicle is able to re-start once the ignition is turned off.
During SHED2_CONTIN, a message is displayed to the vehicle operator notifying them of the vehicle's charging system status.
Independent of load shed requests, the Load Management control can request boosts to the engine idle speed.
Boosting the engine idle speed allows for increased output of the alternator to deliver more current to the battery.
Idle speed increases are done through network IBoost messages.

Load Shed Charts
The load shed charts provide a general overview of the features available on the vehicle based on the build options.

Thank You!!!!

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