Rewiring USB Ports

430 hp 70

Member
Has anyone rewired the factory usb ports to run off an aftermarket aux battery setup? Currently the rear passenger ports are only able to charge with the ignition switched on, and the 12v seat base is accessory. I haven't owned a vehicle that didn't have something hot with the key off. I can't find a reason why I couldn't cut the wires and rewire from my aux fuse block and haven't found an answer while searching the forum. I want them hot all the time.

I'm going to add a single battery to add charging capability, a small air compressor and a water pump for camping/ beach washdowns. Already purchased a si-acr and still working through my wiring setup.
 

JIB

Member
I don't have my van here to verify, but I believe the USB-C one under the cup holders in the bottom center of the dash is hot all of the time. It's a single USB-C. We keep a cord on it because it's easier to use than the ones in the top of the dash.

Jack
 
I don't have my van here to verify, but I believe the USB-C one under the cup holders in the bottom center of the dash is hot all of the time. It's a single USB-C. We keep a cord on it because it's easier to use than the ones in the top of the dash.

Jack
It is not hot all the time. Once engine is shut off and you open drivers side door the power is killed to radio and USB-C
 

autostaretx

Erratic Member
If you have an MB-installed "additional battery" (under the passenger seat or under hood), then they tie the USB-C socket to that.
If you don't have that extra battery, the USB-C socket is powered by the starter battery.

So, depending upon your pile of options, "your mileage may differ" regarding that socket's power status.


AuxBattPowers.png

USBsockets.png

--dick
 
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430 hp 70

Member
I do not have the factory aux battery but I don't believe that it changes when the usbc outlets are powered, only where they get their power from. I could be totally wrong.

If the above is true and the outlets remain hot with the factory aux battery, where do they terminate and how could I move them to my aftermarket house battery? Are they tied to a buss bar under the drivers seat and possibly as simple as moving a connection to a different buss bar?
 

430 hp 70

Member
The 2019 equipment book lists the word "sockets" only twice and only for the usb ports and 12v outlets. The BEG has the diagram for the 150/5 and it lists A5 and A6 as the connection for "sockets". I'm assuming these connections on the 150/5 are where the factory aux battery connects to the charging ports. Anyone know for sure? Where do the sockets connect when we dont have a f150/5?
 

Attachments

Ferrets

Member
From the "USB Ports overview" chart above, my concern is that any ports listing "data transfer" would be tied into the MBUX for not only data lines but also 5V power. With that, for my build, the plan is to "try" and get the MBUX radio, Hotspot and inverter all over to the house battery - taking those USB ports along for the ride - maintaining MBUX port connectivity. I don't think I have the center dash charging package, but have wireless charging and usb-c under the dash flap.
 

430 hp 70

Member
Thanks for the help. According to the equipment guide, the dash charging is on the aux battery (if equipped), but it appears that option V21 (passenger row usb) is not. You make a good point about the usbc being 5v. May be more complicated than just clipping and rewiring. My van is in the shop so I can't confirm any of this unfortunately.

Is it possible to power the mbux separately from the rest of the vehicle? I'm already putting the amp on the aux, but planned on using it's aux input to play music. That would simplify things even more.
 

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