Dr. G,

That motto has kept my diesels starting for many years. Only recently have I experienced other problems which give me hard starting.

I don't know if your curiosity is still at work on this, but I'll tell you why I think the light did not come on. Although I think it best to replace all the plugs, you may have gotten by just replacing the number one plug. The way the relay measures to see if it's ready to start is measuring current draw on number one.

I think it's better to replace all five and keep the car easy to start. Starters are expensive for these cars, and a hard starting diesel will use up a starter in relatively short order.

I'm glad you're back in the world of easy starting.

Good luck,