Originally Posted by joet19711
so the only reason for a battery disconnect is because the electronics will run down the battery while the engine is running??? I wish ford would just tell you that in the owners manual
I do not know why they say to disconnect the battery. In my year's car (2008) they say to keep the car on accessory, which keeps a great deal of the electronics on, and I do this for hours at a time. So far, I have not run the battery down. (of course, I do not keep the headlights or radio on)
As for the tail lights, I bought a kit from Amazon. It had all the instructions to how to attach (and where) to the tail light wiring, and a 4 wire harness runs all the way to the front of the car, where it hooks up to a 4 pin flat so the MH can run the tail lights. Not any different than if I towed a small utility trailer with the MH.
Also, if you are required to disconnect the battery for the computer as you suggested, I have seen advertised in the past a solution that may work for you...
It was a small device that plugged into a cigarette lighter in the car with the battery disconnected. It also had a 9v battery in it. It provided enough power for the radio and clock presets to keep programmed, but not enough to affect much of any other systems. I used to see these advertised in magazines and on line from the various sources for my automotive accessories.
Perhaps you can look into a device of this sort. It will solve your preset problem when you remove the battery cable.
I personally would try to find out why the manual says to disconnect it before I chose to just not bother. There may be reasons we are unaware of... And those reasons may be to protect the computer, or may be as simple as they use a smaller battery in the newer model...