Ok, I'm pretty much convinced the relay is going. For the last three mornings, or when the temperature is below 50 degrees, the glow plug light works normally (on for about 15-30 seconds, then off. Start car and light stays off) Once the outside temp gets warmer you go to start the car and the glow plug light stays on indefinitely until you start the car. It will go off once the car is started, but come back on (and stay on) in about a minute.

What do you all think?

Glenn

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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)