My glow plug timer seems to have stopped working on my 1980 300CD. The dash light flashes but will not stay on with the ignition switch at position 2. I went through the diagnosis section in the mercedes engine manual and everything checked out. I replaced the glow plug timer and the new one acts the same as the old one. There is still no current going the glow plugs.
I've checked the resistance of all the glow plugs along with the lines to the plugs. I've also checked the resistance of the lines to the temperature sensors? I believe there are two in the head. The sensors seem fine. Now I'm really annoyed, plus I have a $174 part which I hope is not defective. The glow plug timer on my 1980 300CD was used for exactly one model year.
Any suggestions are most welcome.