Date registered: Jul 2014
Vehicle: 1978 240D
Location: Los Angeles
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Mercedes 240D won't start, Glow plug relay?
Hi, I apologize if this issue has been addressed. I'm new here and was unable to find anything specifically to my problem.
I'm using a friend's '78 240D while he's out of the country. I've been driving it for about a month and it has run great. I went to start it this last week and turned on the glow plug. I walked away for a minute to put something in the trunk and there was smoke coming thru the dash vents. I quickly turned the plug off and found the relay box and blade had melted and fused together (see first picture).
I am not mechanically knowledgable and after reading more about it and speaking with the owner, I realized the relay fuse was not even in the plastic box to begin with. Also, that "it was already semi-melted together" according to my friend. Maybe it contacted some metal and shorted when I tried to start it? In any event, I disassembled and cut away all the melted plastic from the blade fuse and wires. I then reassembled (without the box as it was destroyed) to see if the glow plug would work. It lights up and I can hear it as normal, but when it switches off and I turn the ignition to start the car, there is only a click sound. Sometimes several faint clicks. The blade fuse is intact albeit damaged looking. It doesn't seem like the problem lies here although I have read that a blade fuse with even a hairline crack or any damage can fail. The connecting wires are in fine condition, and like I said the glow plug does come on and it sounds normal as it's doing it's thing so seems like the relay is working. I was considering buying a new blade fuse and box just to see if it would effect the problem, but it just seems like it is something else to do with the charging system. But it has to be related to the relay box burnout.
Is any of this familiar to anyone? Maybe the relay problem caused a failure somewhere else? Thanks for any help. I can take more pictures if you like. And all fuses in the central box are good.