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Old 07-17-2012, 07:20 PM
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Join Date: Feb 2012
Location: oakland
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Checking glow plugs on an upgraded 240D system...?

my friend's 240D is having increasingly harder starts, so i thought along with checking some fuel stuff i'd help them check the glow plugs. they have a 1977 240D, initially had the old style glow plugs wired in series. the previous owner upgraded to a system that uses a push button under the dash to manually control the plugs. any initial thoughts on checking their function?

on my 300D i check the GPs at the box on the fender, but i'm guessing the push-button system overrides the relay there?

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1981 NA 300D 310k miles
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Old 07-17-2012, 07:25 PM
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Join Date: Jan 2002
Posts: 18,350
Procedure to check depends on whether the original loop style plugs were replaced with pencil style. If it's loop style, just look at the squiggly wires between the plugs. They should glow a dull red if energized for a while. If they don't, the plugs aren't getting power or one or more of them are burned out.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
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