The CEL will reset. Not sure why you have the glow plug light still on. I think the resistance readings look ok. I would check them and the connections once more. Seems like you have a bad plug, still, unless the car starts normally, in which case it seems the glow plugs are fine. On my car when a single plug fails the starting event is significantly rougher, and when two fail it is really rough. I have noticed when I change a bad plug, it is usually a pair of bad plugs, not a single bad plug.

Good luck, Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)