First of all I have a 200 mile charger, a Zareba fence doctor and my three ground rods are actually buried in a trench underground. It has been dry so I periodically run a hose over that trench. Now I check the fencer ever day. In the morning the fence doctor will read 5700 volts. Many mornings have dew. Later in the same day the voltage will be 5000 volts. I have noticed if it's raining the voltage will drop also which I would expect. Not a big deal but any ideas? thanks farmguy