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1983 380SEL
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470 Posts
Discussion Starter · #1 ·
Hello,

Is there a way to tell which glow plug is bad before taking off the fuel injector lines, etc?

I have a multimeter, but not sure what to do.

Thanks!!
 

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'84 300D/ dakota benz trk. Sold... miss it. "88 260E '91 190E 2.6 '89 Volvo 240DL "85 300D
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1,252 Posts
unless there is an electrician on here that knows different, you just about have to remove them to check them accurately. use volt meter or ground the plug and apply 12 volts manually, careful, it gets hot.
however, i didnt remove injector lines when doing mine.
 

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2013 MINI Copper S Clubman, '84 300CD-weekend car
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10,152 Posts
You may find something doing a search, but using the multi-meter on the ohm setting, unplug the wire at the relay box, there will be five female ends, touch the red lead to #1 and the black lead to a ground, I use the bolt holding the relay to the inner fender. Do this for each plug.
You're looking for less than 1.
 

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2013 MINI Copper S Clubman, '84 300CD-weekend car
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10,152 Posts
I did not remove the fuel lines either. On #5 I did move a hose out of the way, and probably moved some linkage too. My hands were cramped after, but got it accomplished.
 

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1983 380SEL
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470 Posts
Discussion Starter · #6 ·
Wow you guys are amazing!! I must need smaller wrenches haha!!
 

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2013 MINI Copper S Clubman, '84 300CD-weekend car
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10,152 Posts
I did use gearwrenches, they are a big help.
 

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85 300D
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285 Posts
i've done it both ways..

TAKE THE INJECTOR LINES OFF

its way easier
 
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