If they are wild, they might be males. You can easily tell at bloom. A male flower will be staminate, and the female will be pistillate.
Here is a photo of a male flower

http://images.google.com/imgres?imgurl=http://www.all-creatures.org/pica/ftshl-grape-27_small.jpg&imgrefurl=http://www.all-creatures.org/pica/ftshl-grape.html&usg=__w5LPoYn0TnQpECFa9l2ub1pAICU=&h=190&w=200&sz=9&hl=en&start=4&sig2=id8PrRhqFnpZ3sCiqPBXsg&um=1&tbnid=2cLJq-OVukRIuM:&tbnh=99&tbnw=104&prev=/images%3Fq%3Dgrape%2Bflower%26hl%3Den%26sa%3DG%26um%3D1&ei=e-GvSsr9JJfatAPz8_HDCw

Many newer muscadine selections are self fertile. They will also pollinate females. I have never seen a male vine for sale, though they must have been long ago.

Seedlings in the wild or from old selections are males in 3 out of 4 I believe.

If I had that problem, I would have my county agent out for a glass of Ice Tea & a look see.
Please get back with us, when you find the problem.
SORRY I was not more help.

gonebananas did that 3/4 number come from some where semi-official, or just someone complaining? If you crunch the numbers it would seem that a wild grape at 1:1 would out compete the 3:1 grape in a few dozen generations. Although with some chromosomal situations it is possible for something like 3:1 to take and hold an advantage.

I think I read it in the elder Mr. Ison's (horticulturist, not scientist) descriptions of Dr. Fry's (scientist) later research efforts after retirement, which were done at Ison's nursery. This would have been read on paper. A quick Google and Google Scholar search just now couldn't confirm it (too much is on breeding for perfect flowers and too much is at subscription sites).

I'll keep looking now and then.

I had a smilar issue as "Ibruswi". I have 2 muscadine vines that I never bothered to prune, however, for the last 8 years, they produced more than enough fruites for me and give some away. Last spring I pruned them similar to what "Ibruswi" did, and I didn't get any fruits.

Not sure if the is the right place for a question I have wild vines that don't produce can I do anything to help them produce again

Muscadine like blue berries, produse on new growth, that why vineyards prune in February.

You should have a "T" shaped main vine with smaller vines hang down, they should be pruned to 2 inches or 3 buds. You may have a overgrown arbor, if so you may have to wait 3 years to get enough new growth to have a good crop. Did it bloom in Spring.

https://extension.uga.edu/publications/detail.html?number=C949&title=Home%20Garden%20Muscadines

Douglass many wild vines are male. All the ones around my property are

Douglass, Kevin may be right, we had lots of male vine we just did not notice them when we looked for fruit & when it was not fruit season all vine looked the same.

I know a muscadine grower, when I can I will ask him.

Thanks joe I wanted to knoww can I plant some