12 volt plugs

You could to into an existing line but would need to determine the existing load and what the additional load would be so as to not overload the circuit. I have made similar additions for my TPMS, cell phone, iPad and GPS devices.

Usually your fuse panel for 12v is in the rear of the MH. You can run wires from the panel through your bedroom floor next to your bed and secure an outlet. Use a heaveier gage wire based on the amp draw of your device you want to run.

Didn't think about turned my off th battery disconnect. Lol. I assumed they were to the chassis, but someone be else said elsewhere that one of theirs in their days went to the hous battery. Basically same unit.

Can I use other 12 volt line to splice onto like a light? What I am wanting to do is figure out a way to power a cpap when not on electricity. The battery bank is in the front part of the Motorhome and the bed is in the back. There are no 12 volt plugs anywhere else in the coach. I though it getting a pure sine wave inverter and installing it, but the. I would have to run an extensions n cord through the Motorhome because of trying to mount the inverter near the batteries. And then Finding a good pace to mount it is another thing.

Those sockets are part of the Ford chassis, so are almost certainly connected to the chassis battery and not the house battery. Thor would have had to do some significant rewiring to do otherwise. On the Ford vans, the sockets are generally powered all the time, not just when the ignition is on (as with some vehicles)...at least, that's how it is on the older model years.

There are a few fairly easy ways to check. One is to turn off the house battery disconnect switch and see if they go dead. Another is to check their voltage when connected to shore power: the house battery and house electrical system should be at the voltage put out by the converter (13+ V) while the chassis battery most likely will be at its resting voltage (12.5 V maybe). If the chassis electrical system is also at 13+ V, it means you have some sort of a setup to charge the chassis battery from the converter, which is a handy feature to have.

A third would be to pull the fuse in the Ford fuse box for the accessory socket(s) and see if they go dead. Finding out which fuse or fuses this is may be easier said than done.

As smkettner wrote, installing a socket is quite straightforward once you've got power to where you want it. Some are designed to be grounded through their mounting screws, which probably will necessitate rigging up a ground lead to the shell or mounting bracket of the socket.

Usually the dash is all part of the chassis.

Connector is easy to add. Pulling the wire might be a bit of work.