To tell you truth I have no clue about the relay. I assume its working, and can hear it clun off after about a minute. As we speak, I have 3 old plugs and one new Autolite plug. Ive read stories of Autolite plugs burning out, and it seems the best ones are Beru. I am tempted to ditch all of them and buy nice new Beru plugs. I have another relay in my garage taken from a 300D/240D in the junkyard. Can't remember which one. This problem has just started to occur. It was worse before, and would require three preglows before combustion. Better fuel has remedied this, inline filter is nice and clear, and I can pass ligh through it. Bad compression is not an issue, as engine has been rebuilt about 19K ago. We'll see what happens tommorow after I let it glow thw hole 1 minute. This whole cold starting b/s is starting to irritate me as it would start fine without a problem about 2 weeks ago when it was the same temperature out. I started fine yesterday, jst as you described. We'll see what happens tommorow. Maybe some remnants of that bad fuel? I hope its not water in the diesel. I went to some no name diesel place, and this b/s started. I hope its just poor fuel and nothing major. Can't hurt to replace plugs.