Modulator.......
Do you mean the circuit board that is on backside of water heater tank?
IF so and moving the wiring on it does affect the electric operation then you could have a 'DEL' model
Similar to the way Atwood uses DC to trigger AC to the element
DC goes to a DC/AC Relay...DC from electric on/off to JUNCTION Box to relay to element. Ground wire (Yellow) from circuit board ties to ground in junction box
No solid ground no electric
2 Junction Boxes (looking from the rear).......One left side/DC and One right side/AC----DC/AC Relay in AC Box
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