Glow Plugs and Relay

[swannymere]

Saw this on another forum, it's a great link to a site which explains how to check the glow plug relay and glow plugs.

Mercedes Diesel Glow Plug Repair

 

[Danny DeVito]

Thats pretty good. I had a fault on three outputs from my relay. I cut off the seal from the relay and inside there were four copper strips. Each feeding a plug. The strip was cut down the middle , one side thicker than the other like a fusible link. The return side had burnt away on three of them. When the relay sees no return through this link it doesn't bother switching out power. I soldered in small pieces of wire and it works fine again. I have no idea why they burnt out but i assume it was due to faulty plugs or something. I only have the car a little while so i don't know what happened before. Anyway good link Bye

 

[johnsco]

A good write-up.
Thanks.

 

[thetowny]

ML 270 Glow plug relay location

Thanks, has helped me know what i am looking for, but can any one suggest the location of the glow plug relay on a ML 270 CDI. I have replaced all glow plugs but the light still comes on. When i switch off the engine when it is warm and back on again, then the glow plug light extinguishes.

 

[MERC'ED!]

I checked out my plugs, using this guide, BUT cannot seam to figure out the pinouts to the glow plugs? (& its too tight to mess with the conectors around the 1st & 4th rail glow plugs & injectors)

I am unsure weather its the last plug or the 1st plug, As one seams to be shot!

Any ideas?

 

[jaymanek]

Thats pretty good. I had a fault on three outputs from my relay. I cut off the seal from the relay and inside there were four copper strips. Each feeding a plug. The strip was cut down the middle , one side thicker than the other like a fusible link. The return side had burnt away on three of them. When the relay sees no return through this link it doesn't bother switching out power. I soldered in small pieces of wire and it works fine again. I have no idea why they burnt out but i assume it was due to faulty plugs or something. I only have the car a little while so i don't know what happened before. Anyway good link Bye

they normally burn out due to a poor connection somewhere or if a wire has chafed through. .