It looks to me that we are dealing with semantics.
To one side, "Free Energy" means that there is energy that you don't pay for. Sunlight, magnetic fields, and waves are free.
To the other side of the coin, "Free energy" means that you extract energy for free. Unfortunately, the extraction gear costs money, but since solar panels and wave generation only cost so many dollars, the free energy eventually pays for the cost of extraction.
Rob,
Thanks for pointing out the distinction between "free", as in not having to pay anything additional (i.e. in other than original investment) and free as in being created without any energy cost.
The former is an example of an open system, where the energy comes from outside the machine using the energy. A closed system, e.g. the car itself in motion would be an example of a closed system, where there is no external source of energy. The only energy provided is within the battery and/or internally stored fuel.
I've typically ignored threads such as this, as there are enough other people in this forum who have the knowledge to appropriately reply, and I usually end up seeing the thread after many of them have already replied. Also, usually the person who starts the thread doesn't have any significant knowledge of physics to start with, and in most cases doesn't have the inclination to learn it.
However, I do wish to point out to Jossamer the following two points.
1) As already noted by someone earlier, start with a small relatively inexpensive prototype.
2) If by some miracle your idea works, when you apply for your patent don't use a phrase such as "runs indefinitely without further input of energy", or any other phrase that is similar in nature. If you do, the examiner will interpret it to be a perpetual motion machine and dismiss you as delusional, or a charlatan. Instead use a phrase such as improved energy recovery device.
However, even less expensive for you, purchase a small generator or alternator that can be hand cranked. Crank it without being connected to any wiring (load) and note how easy it is to turn. Then attach a heavy wire across the output terminals and see out much harder it is to turn. That will illustrate what others have been saying about how regenerative braking works, and why you have to have an additional energy source (i.e. in this case you).