Follow the passenger side positive battery cable down to the grid heater relay between the battery and the engine.
The relay has two large terminals and two small terminals on top.
One of the large terminals is connected to the battery and the other large terminal (the one you will disconnect) goes to the grid heater.
Once the wire that goes to the grid heater is removed from the relay zip, tie it out of harm's way; no need to insulate it as it goes to ground through the grid heater element.
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