Well, to eliminate the guesswork...I went ahead and removed all of the glow plugs, and they all read infinite individually, when testing them with an ohmmeter, with one probe touching the wire shaft, and the other touching the threads that contact the head...I know this is the proper way to test parallel plugs, is this the correct way to test series plugs? I guess this means they are in fact ALL bad?..wow.

Am I correct in thinking that the squiggly wires carry the positive current, and the glow plugs ground in the head? If so, then what is that ground strap for at the number 1 glow plug that attaches to the block??

A little help please...lol.

Oh, and about the Autolite plugs...I know their SPARK plugs work very well in Supra engines running at high boost, in fact it's what almost everyone in the community recommends...I suppose it's possible that they don't make they glow plugs as well, but it really doesn't matter, since they don't carry them anyway...

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles