ZeusDriver
Well-known member
- Joined
- Dec 1, 2025
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- Location
- East Coast, USA
- Vehicles
- 2022 Lightning
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- #1
This may be of interest mainly to techies and nerds:
I wanted to look at the schematic for how the 12V battery in the Lightning is charged... to see, for instance, if there are any relays or MOSFETS outside the DC-DC converter and the little BMS module that hangs off the battery.
So I googled:
ford lightning schematic for 12v battery charging
Here is what Google AI came up with:
"The Ford F-150 Lightning manages its 12V battery automatically via a DC-DC converter, drawing power from the main high-voltage (HV) battery when needed, so a separate schematic isn't usually required for routine charging; instead, you monitor the battery's health, perform a BMS reset after replacement using accessory mode and pedal/headlight cycles, and use jump points (not directly the 12V battery) if jump-starting, avoiding orange HV cables."
Hmmm. If a schematic were required for charging, then I guess I would have to print it out, roll it up, and soak it in salt water to make it conductive, and use it as a cable?
"Instead, you monitor the batteries health..."
If only we could do that more easily.
I wanted to look at the schematic for how the 12V battery in the Lightning is charged... to see, for instance, if there are any relays or MOSFETS outside the DC-DC converter and the little BMS module that hangs off the battery.
So I googled:
ford lightning schematic for 12v battery charging
Here is what Google AI came up with:
"The Ford F-150 Lightning manages its 12V battery automatically via a DC-DC converter, drawing power from the main high-voltage (HV) battery when needed, so a separate schematic isn't usually required for routine charging; instead, you monitor the battery's health, perform a BMS reset after replacement using accessory mode and pedal/headlight cycles, and use jump points (not directly the 12V battery) if jump-starting, avoiding orange HV cables."
Hmmm. If a schematic were required for charging, then I guess I would have to print it out, roll it up, and soak it in salt water to make it conductive, and use it as a cable?
"Instead, you monitor the batteries health..."
If only we could do that more easily.
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