So I found the correct wiring harness for my stock plugs.
I hooked everything up, and no power to the radio.

So I got out my multimeter, and I have key power, but no constant power.
Check the fuse, and it's good.

What am I missing?

 

Two guesses. You're either working at the wrong fuse or someone has worked on the wiring before and screwed with the wiring. If the circuit you think is the 12v source is indeed the right one, then you ought to be able to use your meter to do a continuity test from the fuse panel to the wire at the back of the radio.

You said you checked the fuse but did you check for 12v there?

 

I did check for power there, and did have it. So I guess I need to do an OHM test from the radio to the fuse panel to see if there is a break.

I didn't notice a harness that was unplugged, that looking to be my cig lighter. Maybe having that unplugged doesn't give me power to the radio?

 

There are two fuse panels when it comes to the radio, the fuse you are looking for is to the right of the steering column. Here's a link to a thread that helped me.
https://www.thirdgen.org/forums/car-...-constant.html

 

I looked at that one as well, seems a no go. As the diagram posted shows the lights on the same circuit, and those do work.