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Thanks everyone for posting your thoughts and advice, especially the PDF pages of the manual were great.
So, in the end, it was the filament. This is the filament inside the "salt shaker" on the dashboard. I was using a too thin filament, too much resistance, and it was blowing before any current could get to the actual glow plugs. On a recent trip to Germany, I picked up a few original bosch filaments, as you can see much thicker, and now everything is normal.
Anyone ever seen these thinner filaments or know for what application they are for?
Incidentally, you mentioned a "ballast resistor" on the firewall. My W110 has this in place (no coil inside), but it is bypassed and the W115 doesn't have it at all. Everything seems to be working ok.... I have tried to find replacements, but it seems this part is really unobtainable. If I can find one, I will restore the system to use the resistor.
Both cars with the loop style in-series glow plugs.
Anyway, thanks again everyone for your input! This Sunday a new rebuilt automatic transmission for the W115 .... !
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