240DOwner,

Sounds like a low voltage problem.  Are you SURE that the battery is OK?  Low voltage will cause relays to buzz.  They are trying to close, but the voltage is not high enough to produce a strong magnetic field.

Good Luck,

slk230red

How old are the glowplugs?  I've owned 2 different 240Ds, and when I replaced the glow control I also replaced the four glowplugs -- in fact, they came together as a kit from Bosch.

I'm fairly sure the glow control will not work properly unless it senses the appropriate resistance from the four glowplugs.  Also check the routing of the glowplug cabling to ensure it is not shorting against a metal surface along the engine.  That could certainly make the relay "buzz."

Good luck.

- Fred

'82 M-B 240D 211K * '86 Porsche 944 turbo 54K * '70 Triumph Bonneville 650 *