Here are your parts
Replacement parts for WHIRLPOOL RES7648EQ2 | AppliancePartsPros.com

Here is the wiring diagram
https://www.servicematters.com/d...0Sheet%20-%203406692.pdf

So, is there a capacitor or something that might not let the motor fully "power up" that needs to be replaced?
No

I also took it all back apart and ran the motor without any load on it, and it is doing the same thing, - trying to start and not be able to.....
This definitely indicates that the motor is shot.
You could check that it is getting 120 volts just in case you have bad push to start relay contacts, this is a bit of a long shot.

I have spent over $180 on this dryer in past 4 months! new belt, tensioner, bearings, heating element, and now the rear seal and am afraid a new motor isn't worth it.....
At approximately $80.00, it may be worth putting in a new motor if the unit is in good condition. With $180.00 you have a fair number of dollars invested into it already unless you can return some of these parts and get your dollars out. I think you have to look at is from the point of view that would you have put a motor into it if this was the original problem. It the answer is yes then you would be putting a motor into a much better unit than it was back then because of the parts you have installed.

Hoping that this post is linked to my previous post:
Roper dryer - bought a motor from your site (saved about $50 bucks as to buying locally and it arrived NEXT DAY!) -WOW!
so, when I had this thing all apart saturday, I was wondering how to separate the motor from the shaft as it goes thru to the otherside to provide the spindle for the blower to turn - not seeing just yet how to separate the two? of course, trying not to break anything and buy any more parts than I already have! is it just a pull-a-part or can you give me any advice albiet maybe so obvious?

geez, louize.
I've spent, well, I'm not gonna say how long I spent.
I put a big crescent wrench on the motor end shaft, got it propped against the inside wall, put two (thats 2) pair of vice grips on the fins of the blade, and proceeded to apply gorilla torque technique on that mofo and it didn't budge nothing doing. This is the kind of sI>it that drives me crazy!!!! I know theres a trick to most everything and sometimes its just over thinking the solution. Can I just spare myself some further frustration and agony and have the satisfaction of breaking that s::mb:tch off there, probably cut my hand some more doing it, or is there any last hint to offer before I resort to submitting to my antagonistic situation?!!!????!!!! aaaahhhhhhgggghhhh!!!!! I hate to admit we are going on two weeks now without a dryer. and I live in a covenant neighborhood where clotheslines are prohibited!!!!! you ever tried to air dry clothes inside???

signed, so close but yet so far.

Glad to hear you got it up and running.

Sounds like the struggle you had came with a sweeter victory when you beat it.