Suddenly Lost Power

Hot diggity dog! I went outside and checked the negative battery cable grounded on my engine block. It wasn't as tight as it could be. I tightened it down real good and, voila, that sucker started right up. Bless you, Ramcharger. I was going crazy trying to get back on the road.

Still, I'm concerned about other electrical problems after having read some other posts on this board. Should I go ahead and replace my voltage regulator? Also, my negative battery cable does have that little pigtail on it with a yellow clamp. Am I suppose to do something with this or get a cable that does not have it?