Somebody will come along who knows the answer, but if you're in a rush (you seem to be sitting there waiting
) and the car is there, then start pulling plastic covers off of stuff in the engine bay. It should be something about the size of a pack of cigarettes, and you can follow the glow plug wires to it. There's a metal strip inside held down with two screws. Careful - one end is energized all the time! Loosen the screws to check as they can be cracked and still appear good.