I just got an 87 300 TD wagon, The prior owner changed all the glow plugs one year ago. The other day the car would not start and the glow Plug light would not come on, the Relay fuse was burnt, so i put in a new fuse and it burnt out immediately. So I ordered a new relay from MB-but I am wondering if it is a good idea to change the glow plugs also? how ofton should they be changed?
I also have one other concern: I am a Ham radio enthusiest, and I hooked up my 11 amp radio into a cigarette lighter adapter, and THAT is exactly when i noticed the problem began. I asked a mechanic who said it is unrelated because the cig lighter is a different line, but just wondering