yes check the relay. BTW- the 1972-1989 SL class were called "der Panzerwagon" by the germans...so by your name they might think you know alot about the 107's....

I have the same problem in my 560SEC 1989.

__________________
Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

http://search.ebay.com/_W0QQsassZkhazenzcc

Do you mean you have a Glow Plug lamp?

Many thanks for all the replies.

I believe my mechanic has a known good relay that I can use before I buy a new one. The last 5 years I have bought an awful lot of parts I probably didn't need (the last being new injectors) and wish to cut down on unneeded purchases.

I will assume that my mechanic checked the wiring to the GPs themselves when he changed them out but I will confirm with him. I will also look at the wiring to the relay in the meantime. The fuse is present and intact (the thick metal one on the relay itself). I assume that is the fuse mentioned in the thread. Somehow this problem is engine-tempature related, or the least, engine tempature brings out the symptoms. First crank on a cold morning the GPs always come on. Drive around for a bit, let the car sit for 10 minutes, then they don't..... strange.

MTU, I didn't know that about the 107s; I'm a military history fan and this car is built like a tank so Panzer seemed like an appropriate nickname.