Hot Water Knob Drips When Cold Water Is Turned On
Try tightening the packing nut on the hot side. If that doesn't do it you need to put in a new packing nut washer or rope. Here's what's happening: both valves closed it's not going to leak from either stem, hot valve open there's no pressure on the stem because all the water is going to the diverter and cold valve which will leak from the stem if the packing is bad, cold valve open water is going to the diverter and the hot valve and leaking out the stem.