How rapidly does it flicker?

If it comes on after the engine is running, stays on for a few seconds, and then goes out, that is the self-diagnosis telling you "Houston, we have a problem!".

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

It flickers intermittently, every 5 to 10 seconds or so, though not with that kind of dependable regularity; it's more random. It doesn't really ever come completely on, rather, it flickers with partial power. It sort of reminds me of the warning light for a slightly failing generator or voltage regulator in an old gas car.

__________________
Will



72 280SEL
85 300CD 288k
00 E320 Wagon 4-matic 100k
11 E350 Wagon 4-matic 45k

73 VW Westfalia Camper
67 VW Westfalia Camper

66 Porsche 912

I had that problem on my 83 300D and a new glow plug relay solved it......

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)