Background, I have had this car for about 5 years. I replaced the GP wire harness about 4 yrs ago, and the glowplugs about 1.5 yr ago.

About a month or so ago the GP indicator light started being erratic- not coming on when cold and then coming on for a short time until the motor warmed up. About a week ago it stopped working altogether and cold starts were very hard (temps in 30s at night).

I followed the tutorial on Diesel Giant and tested the glowplugs for continuity at the relay- found one was bad #5 cylinder. All other tests of the relay were fine- power at relay 11.8v and power to GP connector good on all cylinders at 11.6v.

Pulled the bad one last night, and put a new one in after I tested it for continuity and also put 12v on it and got nice red hot tip. Engine was still warm last night so I couldn't test it.

This AM I get up and try it- no GP light and hard start (42F ambient temp). Still get good current at relay and GP harness plug, and all GP test good for continuity between .4 and .7. Odd thing is that after starting up, the GP light on dashboard will come on for a short time.

Is it the relay? Did I miss anything?

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1995 E300 diesel