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Update: I followed ellpee's instructions and it tested good. The guy at the electric shop was also very helpful. After I put most of the pieces back on the scooter, I took it out for a 15 mile ride at about 40-45 mph. The gauge never went more than a little above 1/4 on the gauge. The weather here in Florida was about 65 with winds 20-25 mph. So the electrical problem seems to be fixed. I am going to make an emergency kit with cable and tools just in case I have overheating issues again. (cable that goes from battery straight to fan) Of course that won't help me if the fan goes bad. I am going to take it for a ride again tomorrow to sub teach at a school that is about 8 miles away.

The only issue I have now is putting the scooter completely back together. Some of the holes aren't lining up between the back plastic and center. (hole closest to the battery) I probably just need to put some pressure on the pieces to get them lined up. Until I get that done I can't put the side plastics back on. Probably will wait until next weekend just to take a break. I'll take that time to also ensure all the screws are still good and tight.
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At least mechanically, everything is working thanks to all y'alls help. I feel like I can handle just about any issue that comes up with your support.

Update: I found the problem! After reinstalling the thermo switch and radiator, I ran the scooters engine and it began to reheat again. I played with the pins a little still nothing. Then I followed the wire up to where it was tied to the bundle of wires that goes to the front powering the dash and headlights. I kind of smooched all the wires together and the fan started working. The scooter then cooled down to about 1/2 on the gauge which is a little warmer than when I was riding in the winter. Probably because the weather here is warmer now too. I wrapped the wires tighter and zipped tied the problem area so it won't be loose.

Next I plan to put some of the pieces back on the scooter, like the seat, )so I can test ride it around the block. I hope the scooters overheating issue hasn't caused any engine damage. I did notice some non-oily black specs in the coolant.

The idle is a little high at 2200 rpms too so that might be another reason it is warmer. Since everything is still off the scooter, I'll try to lower that to about 1700-1800 rpms which is what the factory setting is supposed to be.

I will keep you updated and thanks again for your help.

Thank you guys again and sorry if I am fuzzy on all this. I am definitely a student when it comes to working on mechanical things.
I will test out the thermo switch today first by touching the leads and seeing if the fan comes on. If the fan comes on, need a need thermo switch. If it doesn't, then I'll check whether or not it is getting voltage once the scooter warms up.

I don't completely follow you on this part. In my mind there is no voltage from the battery to the fan; it has to pass through the thermoswitch first. Maybe we're just saying the same thing different ways. Can you clarify?
I am still trying to figure it out so what I said earlier is incorrect. I will tinker with it some more and explain it.
Thanks again guys.

Update: Voltage from the battery to the fan was good. I removed the plug connection from the battery. That was good. Then I plugged the ends back together and still had 12v on the fan plug side. The fan works very good too after hot wiring it from the battery.

I then burped the radiator again just to make sure that wasn't the problem. To burp the radiator, I let it get real cold, then remove the cap. I start the scooter and wait until the coolant is almost coming out the top. Recheck after it gets really cold and add coolant as necessary to fill it to the top. Then put the top back on. Let me know if that is the wrong procedure. The last time I did it I couldn't add any more fluid. Let me know if that is the incorrect procedure.

I started the scooter and again, after almost exactly minutes in idle, the temperature reached to between 3/4 and the hot line just like it had been doing and the fan never came on.

Then I removed the thermo switch from the radiator and followed a youtube video (https://.youtube.com/watch?v=lkwJoLBGr9Q) on how to test if it is good or not. (cold the switch should not have continuity -multimeter showing 1- and at about 170 in water it should show continuity (actually displayed the water temperature I think, showed 170 and the number went down as the temperature got colder). Do you know if 170 is to high or is that ok? I will wait until someone tells me if that's ok because getting that switch off was a huge pain. I had to remove the radiator because the bolt was on very tight and there was no room to get a wrench around it without having it on my workbench. Also, I forgot to remove the coolant before I took that thing off and now I have a green floor.

Now I am not sure what to do next. The connections looked good. The coolant seems to be flowing through the radiator because all of the hoses are very warm. The only thing I haven't checked is the voltage going into the thermo switch. The two pins going to the switch were good and tight when I pulled them out. I think I checked the voltage and got a very low reading but I'll recheck. Does it matter which pin goes where on the switch? What voltage should it be getting?

Any suggestions on what I should try next? The scooter is in about a billion pieces right now so I can access just about everything on it. The one thing I keep thinking about is the burn marks inside the connections. However, I get voltage through the wires anyway. I am also thinking about getting a rechargeable 12v battery and just connect the fan to that. I think I could rig up an on/off switch so wouldn't have to disconnect the battery every time. Thanks again guys..

Update: Decided to remove the other side panel. Now I can clearly see the back side of the radiator but still can't follow where the wire is attached to the battery. I really don't want to remove the middle area because that would mean I'd need to almost remove the rear section. I will try again tomorrow when it's daylight or maybe in a few days. Thanks and hope everyone here is doing well. If you guys ever come to Northern Florida, let me know. If my scooter ever sees another mile, we could go up along the coast line.

Brian

Never mind, I got the cover off. Just was a little stuck.