The 300TD had been experiencing a "quick GP light" for the past week (the light would go out in a second or two) and finally it stopped coming on at all today along with no glow at all

I removed the glow plug relay and found a 100 microfarad 16V capacitor on the board had "exploded" (well, its insides had pushed out through the bottom). I went down to radio shack and bought a 100 mf 35V cap for $1.29, soldered it in and low and behold the relay is working again and the light stays on for the normal cycle time

Thought I might pass this along since there may be others who experience the same symptoms or have a seemingly dead relay.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz