Update...I pulled the battery out, unbolted the ground strap and cleaned it very well. Cleaned the bolt and the spot where the strap attached to the frame too. My lights are still weak at idle, but when I rev the engine up they get brighter and look to be decent candlepower. I didn't mention earlier, but before this the lights would not brighten much at all when the engine speed increased. I am guessing that my charging system was unable to work effectively because of the corroded ground strap.
I'm charging the battery and hope that helps the weak lights at idle. If not, I may try a new battery. I don't know how old my current battery is. It reads 6 volts across the terminals though some resources state it should read about 7 volts at high idle with the charging system working well.
Thanks for your help and suggestions with this.
Nick