it is in the relay, defenatly have them checked.<br> things to look out for:<br> * cut out timer<br> *fuse<br> there mightnt be enough power getting to the plugs<br> <br> check the out put of the altinator, and how old the batt is.<br> <br> there is an option, take the whole system out and have manual pre-glow button. i now have a 300d (2nd one) it has a brand new glow plug system in it, costing about AUD$300, after a surge in power blew out the whole caseing. in our first 300d the previous (and life long owner) had the timer taken out and a manual button put in.<br> in winter hold it down for 30 sec in summer 10-15sec.<br> <br> if u have been driving for a while and the engine is around 80*C then glow time may only need 3sec.<br> <br> good luck <br> <br> louis <br> sydney