I ran across a situation where I have a 3Ph 480V contactor, when the switch is in the off position I have 0V on the load side, when the switch is in the manual position I have 277V on each leg of the load side but when the switch is in the auto position I have 13V on each leg of the load side. Could this be feedback from what ever is switching (ie. thermostat, pressure switch)? Any ideas and is this normal?