71 super beetle just clicks won't turn over?

If you absolutely know you have a good charge then check to make sure both battery cables and battery posts are "shiny" clean. Get one of those wire brush type post cleaners and do the cables also. If that doesn't do it then un-tighten the battery ground strap to the body and clean the area by the bolt. Do the same for underneath the car also.

Another area is to make sure the fuse CONNECTION for the ignition is clean also. some times you can check it and it will show power but the connections has just enough corrosion that it won't let all the power come through. Just twist the fuse in place and that will tell you sometimes. It happened to me a few times driving down the road and the dang car just quit. I just happened to hit the fuse and heard a little spark and the car started again.