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85 300d, 84 300sd,
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Discussion Starter #1
yesterday when i went to start my 85 300d the glow plug light wouldn't go on and the car wouldn't start (it was 14 degrees out- bad winter!). does this sound like the relay went bad or could it be something else? if it is the relay, is it hard to replace and should i replace the 5 glow plugs also? or should i just take it to the shop and get ready to write a big check [:)]





85 300d 247000 miles
84 300sd 94000 miles
98 vw tdi 109000 miles
 

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1994 SL320, '76 240D
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153 Posts
Most likely the relay. The glow plugs on your car are in series so that if one goes out th...

Most likely the relay. The glow plugs on your car are in series so that if one goes out the other four should still work.
 

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BenzWorld W126 & W201 Host
1988 420SE, 2002 C180 Kompressor, 200 ML320
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1,159 Posts
Non starting

pitbill

It could be the glow plugs of the main fuse. If you have a standard test light, check that there is a feed at the plugs when the igintion is first switched on. If there is then it is probably bad plugs, if not it will be the fuse.
I can't remember exactly where the fuse is, i think its on the inner wing under a black plastic cover. someone else may be able to be more specific.
 

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79' 300D, 85' 300D, 99' CLK430
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59 Posts
This happened to me, and the problem was the fuse. It's located on the firewall, right in ...

This happened to me, and the problem was the fuse. It's located on the firewall, right in the middle section. It's in a small plastic cover, and costs $0.60 to replace. But if it is the relay, that is also easy to replace. Just switch the wires around and mount it on.
 

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83 300TD/97 E320/98 SL500
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105 Posts
re: glowplugs

I've never had the relay go out on my 83 300TD, but I've seen glow plugs go out. The indicator lamp in the dash will not light if one of the plugs has burned out. Even here in Los Angeles on cold mornings, one plug out makes for a very difficult start. On my car, the plugs seem to fry preferentially from the front to the rear of the block in sucession. I've already had 4 out of the 5 changed, and am waiting for the last one to go.
 
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