You still haven't checked THE VOLTAGE. Ground the black lead to the motor case somewhere, like a bolt. Meter on the 20V scale. Red lead on THE BATTERY TERMINAL, THE LEAD PART, voltage? Red lead on the BATTERY CABLE at the BATTERY TERMINAL, voltage? Red lead on the STARTER SOLENOID END OF THE BATTERY CABLE, voltage? Red lead on the SOLENOID STUD, voltage? Red lead on the 30 AMP BREAKER UNDER THE SEAT, voltage? Both sides? Tell us the results of this and we'll go further.

 

You might try pulling the cover off the starter solenoid, remove the spring and plunger, clean out the carbon and make sure you are getting good, even contact on the copper surfaces.

I had the same issue on my 93 FLSTC. Batt. terminals were tight, and showed 12.7v. I changed the starter relay- no fix. Changed the main breaker - no fix. Cleaned out the solenoid and adjusted the contacts - no fix. Added a manual push button to the starter solenoid - no fix. Had the batt. load tested which showed it was week. Replaced the battery and the bike fired like a champ.

 

How do you know the battery is good? Simply reading voltage is no indicator of a battery`s condition. It needs to be load tested.

Forget about checking ohms, resistance is not the way to go about this.

Set your meter to DC Voltage and start reading voltage.

Read the voltage at each post on the main breaker, and at the terminal on the ignition switch, where the tan wire connects.

 

I agree.
Unbelievable amounts of time and money have been wasted, chasing electrical ghosts, only to later find a bad battery was the culprit all along.

At the same time, that doesn't sound like typical behavior of a shorted/surface charged battery

 

Thanks for all the continued help on this issue. I will take all those voltage readings tomorrow and will post hem here.

 

If you still have 12.xV at the breaker, then while measuring it there, push the start button.

 

Looks like it's time for a stubborn idiot confession. Back on Feb 2, 2020 I went out to the garage to start my bike. While it was cranking I smelled electricity and the bike would crank but not start. I took off the seat to look at the battery and found that the negative post had melted. The cable was a little loose but at the time I thought it was because of the melting. Anyway, I tightened it up and started the bike. So far so good. I rode down to the 7-11 about 2 miles away and filled up the tank. When I hit the starter there was a tremendous back fire and after that the bike would crank but not start. After checking everything I could, I gave up and called for a tow home. I checked the spark it was good, I checked the compression it was good, I took off the air cleaner and while messing around with the carburetor I notice that it had separated from the manifold. So I put that back together, sprayed some starting fluid in the carb and the bike started. I let it run for about 30 seconds and shut it off. About 2 hours later after charging up the battery I tried to start it again. Turn on the switch and nothing lights up. No power at all. So now here we are at this thread.
I went out this morning to run all the voltage tests suggested by Dr. Hess. The first thing I noticed was that there was no voltage when checking the Pos. battery post, switch on or off, and nothing at the solenoid connection. I disconnected the neg. cable which was attached to the front of the post and moved it to the top. Turned on the switch and had power. Tried to start the engine and it fired right up. Apparently the short and melting weakened the interior of the post. Even though the battery had a good charge and appeared to be good except for a little melted lead the interior connection of the terminal to the post was weak. Now after screwing the cable to the top of the terminal the force of that operation broke that connection too. So I ordered a new battery. It will be here Friday.
Thanks to all for the help with this issue. Sorry I wasted ya'lls time. All was not lost though. I did learn some things about compression and wiring tests. Maybe someone else will learn from my mistakes.

 

We ALL learn from our mistakes.
Welcome to the human race!
Thanks for the update.
Glad you got it straightened out

 

At least it got figured out! that "glow" you saw was the neg post arching.