2023 Ford Ranger – Battery/Charging Issue After Installing Powered Underseat Subwoofer

[Tmavy11]

I have a 2023 Ford Ranger 2.0 Single Turbo Wildtrak. I recently installed a Nakamichi NBF-10.3 powered under-seat subwoofer using an 8 AWG power wire connected to one of the accessory studs on the positive battery terminal with a 20A fuse near the battery.


Initially, I was using the subwoofer's high-level auto turn-on, but I've since changed it to a dedicated ACC remote turn-on wire, so it now powers on and off with the ignition.


The issue started after the installation. About 2 hours after parking, I came back to the truck and it was completely dead. The key fob wouldn't unlock the doors, there were no dash lights, and no electrical power at all. I opened the hood, pressed down on the plastic positive battery terminal cover, and somehow the truck came back to life.


Since then, I've been getting a "Check Charging System" / battery warning. The warning comes on while driving, then clears by itself after a while, but it keeps coming back intermittently.


I checked the battery voltage:

• Engine idling: around 12.98–13.14 V
• Immediately after shutting the engine off: 12.57 V

I've checked my wiring and nothing appears loose, and switching the subwoofer to a remote turn-on hasn't stopped the warning.


Has anyone experienced this on a 2023 Ranger? Could this be related to the battery terminal/accessory stud, Ford's battery monitoring system, or is there something else I should be checking?

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[Intercontinental_Ranger]

Sounds like something’s loose if it came back to life by pressing down on the terminal.

The BCM is pretty sensitive on our NA rangers, probably same for the T9. Error codes might resolve if you full disconnect the battery for 20 mins to let everything clear.

 

[AugPal]

8 gauge wire? That's normally used for a 40 amp circuit. Have you contacted Nakamichi? Maybe others have ran into the same problem. after using the subwoofer.

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