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fuse is in the relay box, just remove the cover and check it closely.
quick-n-easy on testing glow plugs is to remove the connector leading off the relay to the plugs and you'll see it numbered 1 thru 6. get your meter, set to resistance and check each of them while grounding the other test lead. anything up to 1 ohm is good, anything way over that or open circuit is bad.
for example- I just did plugs on the SDL tonight, its light wasnt coming on:
1) .8 ohm
2) .9 ohm
3) Open
4) .8 ohm
5) 16.5 ohm
6) .8 ohm
Now I'm not sure if its a set rule but most of the ones I've seen that the light fails to come on for, usually have 2 or more failing. one out and the light will usualy come on.
it's easier to just remove the intake manifold- you'll need two gaskets for going back on, unless yours are fairly new. the one I did tonight just crumbled when I took it off. You can typically get away with resuing the large green rings on the intake tubing.
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic
past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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