[glhonda]

1) The low voltage to the regulator on the black wire is definitely causing your overcharge concern. With engine running, apply battery voltage to the black wire at the regulator, and watch your battery voltage decrease to normal levels. There is a fix for that.
2) Resistance to ground? The black wire is ignition, 12v source. You can't measure it's resistance to ground, because to find ground, it needs to go through a component. ie coil, bulb, etc.
The black wire from the ignition switch feeds the ballast resistor (first resistance) at the coils. It then goes through the run switch, the coils, to points, to ground. Naturally, opening the run switch would cause the resistance to increase dramatically.

I don't believe either of these is causing your immediate problem. (Slow crank, hard start)
Add an external battery or (10 amp charger) connected to the battery in the bike and see if it spins correctly. It's quite possible the overcharge has flattened your battery and adding extra load slows the starter process.

 

[glhonda]

What is the fix for this? As I stated earlier, the ignition switch has good continuity, so I'm not sure where else I would be losing voltage. I thought it might be in the ignition circuit, but now you all have me second guessing that. I do need to check all of the grounds.

Checking grounds is always a good idea, but seldom gives you more voltage. Here's a thread for getting your voltage down to where it needs to be. I do not recommend this unless back probing battery voltage to the regulator corrects the problem.

http://www.goldwingfacts.com/forums/2-goldwing-technical-forum/375622-voltmeter-reads-too-low.html