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  #1  
Old 06-13-2009, 01:28 PM
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glow plug relay

more dang problems. is it possible to repair / recondition a glow plug relay ?
mine clicks but no glow or glow light.

im trying to not need to lay the car up for a week while waiting for parts.

the alternator problem was the battery connections i believe. whomever installed the battery last fall did not tighten the cables. i did not even try to start it until april and the batt was dead then and a good charge seemed to make it work again.

but the relay thing, do they come apart ? i did see some small screws but have not taken it off the car yet

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83 300D Alabama Beauty (Son's)
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  #2  
Old 06-13-2009, 02:02 PM
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Have you checked for voltage at the plugs with the key in the glow position?
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1977 300d 70k--sold 08
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1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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1999 Fuso FG Expedition Camper
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  #3  
Old 06-13-2009, 03:33 PM
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not yet. good way to troubleshoot. the relay does click but the plugs do not warm up the engine. (it all of a sudden just would not work) hard to start for the first time in its life.

looks like im on my own on this one. we'll start from scratch.
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  #4  
Old 06-13-2009, 03:55 PM
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They come apart pretty easy, this is from a '94 C250D but I think most are similar -

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1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)
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  #5  
Old 06-13-2009, 03:59 PM
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I think it's premature to condemn the relay without testing for voltage output. Have you checked the strip fuse in the relay?
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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
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #6  
Old 06-13-2009, 04:02 PM
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on mine...

i replaced the glows but couldn't hear the relay click. i took it apart and used an old point file to clean up the contacts on the relay.
now it works great. much cheaper than a hundred bucks for a new one.
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  #7  
Old 06-14-2009, 01:10 PM
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so i checked the voltage at the five prongs on the relay. . . . zero. i took the relay off, took off the cover and disconnected the tiny spring on the side of the relay.

now we can really get at the burned points. scuffed, brushed and buffed them clean, re-assembled and put it back on. yea ! ! ! ! good for the rest of my life i'd bet.

thanks for the helpful information again.

davidh
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  #8  
Old 09-12-2009, 02:35 PM
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I just went through this exact problem. Suddenly the car wouldn't start quickly. It was very hard to start unless totally warmed up. I replaced all of the glow plugs, tested continuity, everything. My relay even clicked.

When I took the relay apart one of the smaller contacts in the row of five was blackened and not working anymore. The relay would click but never energize the glow plugs. I cleaned it with 1000 grit sandpaper and the car starts and runs okay again.

I think I may go ahead and buy a new relay from ******** or get another from a parts car and keep this one as a working spare. Thanks for the helpful posts everyone from a frequent forum searcher!
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  #9  
Old 09-12-2009, 04:27 PM
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you might need to file the contacts?
Attached Thumbnails
glow plug relay-close-view-contacts.jpg  
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E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...
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  #10  
Old 09-12-2009, 06:44 PM
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Quote:
Originally Posted by Olivier View Post
you might need to file the contacts?
Are you competing with me for best close up photo Olly

I think mine adds a certain realism with my greasy thumb almost in view
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1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)
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  #11  
Old 09-12-2009, 07:17 PM
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OK, here is one with the thumb too
Oh, and the fuse blade too, they might be burned, no thumb tho...
Attached Thumbnails
glow plug relay-contacts-filed.jpg   glow plug relay-fuse-blades-1-side.jpg  
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E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...
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  #12  
Old 09-14-2009, 10:41 PM
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Oh well, for me cleaning the contacts worked for about two days. The glow plug light quit working again and the relay is screwed up again, so I ordered a new one from ********. The circuit board has a burn mark near a resistor, and there is no longer any voltage to the glow plugs (which are all new and continuity test was good on wires.

I guess it DID last for 19 years so I cant complain.

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1991 560 SEL
1987 911
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