Because if an electric car could create enough power to propel itself indefinitely you would have created perpetual motion for the first time in the history of the world. Newton says that can't be possible.

Those of us “of a certain age”
will remember Nuclear Power advocates claiming
“it will be so cheap no house will need an electric power meter”.

Less remembered are the “backyard nuclear batteries” for each house that only needed to be swapped out every 50 years.
My Thermodynamics professor had a detailed engineering drawing of such a home backyard buried nuclear battery on the wall of his office.

If you have visited older US Nuclear Power plants you have probably seen the large gravel parking lot-like areas with the large stainless steel casks containing “aged” nuclear waste still giving off heat. I was told if those were allowed to have “thermoelectric junction DC power units” inside next to the radioactive fuel elements they could generate 5 kilowatts each. Instead they just heat the outside air.

Some long life space probes have nuclear heat thermoelectric junction generators..

If each electric car had a 3 kw nuclear battery, over 24 hours of each day it could recharge its 70 kw-hr battery.
Judging from the size and weight of the space probe generators, it might add only 100 lbs or so.

The US Patent Office has granted patents on perpetual motion so it must work!

Perpetual Motion Patents

I am not asking for perpetual motion, just add a couple alternators to give extended range! Racers have been putting pulley's on driveshafts for years hanging an alternator close the the rear end, so any rotating member could be used to put on a pulley and hang an alternator somewhere...

What would that accomplish? What do you think is driving those alternators? Besides, the battery pack requires a heck of a lot more voltage than any alternator you might hang on a driveshaft, or wherever.

EV's already use regenerative braking to recoup energy to some extent. Read up on that because it sounds like you don't know what that is. At any other time the motor is driving things and all you are doing is wasting more power than you could recoup driving something to charge the batteries. Anytime energy changes state (electricity to mechanical, or mechanical to electricity) you have conversion losses. It the cost of doing the conversion. What the percentage of energy is lost is varies depending on how efficient the device is but absolutely zero of the them are 100% efficient. So you lose just in the conversions involved and you'd end up with worse mileage than you started with.

Even if you could make them 100% efficient you'd have a wash, same in as out. You'd have to be more than 100% efficient to gain anything and that's perpetual motion.

I know what regenerative braking is, known it for decades. Posts like yours just say "nothing can be done" and leaves it at that. I am asking for a paradigm shift in thinking, so what you are saying is that there is no reason to even try. ANY help keeping the batteries charged is better than just saying "it won't work"...

I didn't say nothing can be done. I said your idea can't be done successfully. Multiple people have told you it won't work, it violates the laws of physics no matter how hard you roll your eyes.

You want to do something to charge an EV while it's in use? Put solar panels on it, mind the aerodynamics. Get one of those old WWII hand crank generators and get your cardio while you are at it.

Ultimately, the only idea I have heard that might be actually functional and not pie in the sky "I don't know what I am talking about but it sure sounds good listening to me talk" thinking is a wireless charging system imbedded in the roads. No idea on cost effectiveness or charging efficiency.

I talked about the road charging earlier. I just figured there are a few smart people here on the board who might think beyond "the law of physics". Those laws only apply on this planet I am pretty sure...

One wonders where you got your engineering degree, Cracker Jack box?

There is a huge number of Neutrinos passing through us and our vehicles all the time.
That flux of Neutrinos has energy,
but since we do not even know the mass of those various “flavors” of Neutrinos
we are ignorant of even the amount of energy,
and clueless how to power something from the flux.

It gets worse,
Physics does not know if there is “Dark Matter” or “Dark Energy”
although we see behavior out in space that hints there might be.

It is not unreasonable to wonder if in the future electric vehicles can tap into presently unknown power sources.