Recently, I had to jump start my 300SD after some cold weather. I live on the CT shoreline and had to give it a shot of starting fluid to get it to start. I have been in the automotive business over 35 years and was a jet engine tech so I know my way around under the hood. Since starting it, the glow plug lamp on the dash does not always illuminate when turning on the ignition and starting has been a little problematic. I had a friend of mine look up the location of the glow plug relay on Alldata and after finding it, found one of the contacts pushed out. I thought that could be the problem, so I secured it, but am still having the same problem. Could you possibly advise me what to look for or check. Its a great car and I plan on having it repainted this spring, so I want to keep it mechanically good as well. Thank You