How are you determining that there's a ground in the glow plug harness? IF you're measuring it with an ohm meter, the glow plugs are such low resistance that they will be indistinguishable from a short to ground. You need to disconnect all the glow plugs first.
That said, if the glow plugs heat then there's no short in the harness.
Why do you think the glow plug circuit is causing the battery to go dead?
I went back and looked at your original post. The problem was that the starter was buzzing, right? Was that caused by a dead battery? A buzzing starter can be caused by a bad (high resistance) ground. This problem will not lead to a dead battery, though. And, I don't think there's anything in the glow plug circuit that will drain the battery when the key is off.
Last edited by JohnC; 01-21-2018 at 14:35.
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