I have an older moble home I have taken apart the faucets on my bathtub an I have to them back together part way I tired turning on the water beforebefore I finshed putting on the hand it the hot water won't turn on but the cold water dose is there some part I need to repace on the hot water

Baitmouse... start over again... remove all.. the hot AND cold water. Then replace all exactly as the cold water is. See if anything is missing. See if that helps. Let me know.