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3 watt, 24 v Zener

I believe that is a 24V Zener. Not completely sure, once I get a chance to check what the part is, I will advise.

I doubt that the black wire is part of the GP circuit. You will need to trace it out and see what it is connected to. Once you get all the new parts installed and the glow plugs tested, let us know how it works.

Jake, Here is the resistance chart of the engine temperature sensor. As the temp increases, the resistance decreases.