Don't know which system you have -- probably the newer parallel one with no temp sensor.

If that is the case, you have a bad relay. Glow plugs should run about 15 sec or so, maybe more, at 60 F cold engine, and no, it usually won't start. Prechamber diesels are hard to start cold anyway, simply won't fire very well stone cold. You have to crank the .....out of them.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!