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  #1  
Old 12-06-2003, 07:19 PM
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Help with Glow Mystery

1987 300 T
Out of the blue the glow plug indicater light doesn't light and the car won't start.

Has always started very quickly on the 1st turn of the starter.

It was maybe 25 F last night.

Thanks in advance.

Bernie
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  #2  
Old 12-07-2003, 12:20 PM
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Guess

Glow plug relay?
Fuse 80 amp?
Coolant temp sensor?

Thanks

Bernie
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  #3  
Old 12-07-2003, 12:29 PM
Kyle Blackmore's Avatar
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Location: almost beyond Hope...B.C.
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Hi Bernie, I think you're on the right track . Remove the 80 amp fuse and check it for cracks . Check that you have battery voltage at the connection coming to the relay.Pull the connectors (to gp's and to dash) and clean them up . The ground should be removed and cleaned up as well. Once all the connections are good then start testing the system as per the manual.Good luck.
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1985 380SE- 160,000km 'Blistu' - Sold
1988 300CE- Eva,my garage mistress
2007 R350 4matic- The Black Pearl
2011 Ford Ranger-Work truck
1974 25' Trojan Sea Raider- 'Grannyknot'
2002 215 cm Atomic DH skis- Canadian SDH record holder, 175.5km/h- Vars 2010
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  #4  
Old 12-07-2003, 12:41 PM
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Thanks Kyle

I am operating without a manual.
Mine were just uneducated guesses.
I cannot even recall where the 80 amp fuse is located.
Maybe my declining mempry will kick in.

Any idea why this would happen suddenly?

Flawless operation and dependability until now.

Thansk again.

Bernie
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  #5  
Old 12-07-2003, 01:13 PM
Kyle Blackmore's Avatar
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The 80 amp fuse is on the preglow relay, it's a strip of aluminum about an inch long. The relay is on the driver's side fenderwall towards the front. The fuse is held in place by two screws and it might look OK but remove it and check for cracks or corrosion around the screws. If you've had no trouble before that and the other connectors are good there is also the OVP relay behind the battery on the 124. It has a 10 amp blade type fuse on the top of it under a little flip up cover. Also check the fuses in the fuse box , remove them and clean them up if they have any corrosion at all.I have a 124 manual if you need to dig any deeper , good luck.
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1985 380SE- 160,000km 'Blistu' - Sold
1988 300CE- Eva,my garage mistress
2007 R350 4matic- The Black Pearl
2011 Ford Ranger-Work truck
1974 25' Trojan Sea Raider- 'Grannyknot'
2002 215 cm Atomic DH skis- Canadian SDH record holder, 175.5km/h- Vars 2010
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  #6  
Old 12-07-2003, 01:57 PM
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Posts: 167
Kyle II

The OVP is about 2 months old.
The glow fuse is 3 years old.
I am hoping a fuse.

Thanks again.

Bernie
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  #7  
Old 12-07-2003, 02:43 PM
Kyle Blackmore's Avatar
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Join Date: Sep 2001
Location: almost beyond Hope...B.C.
Posts: 897
Hi Bernie, welcome to the wonderful world of MB electrical gremlins. One thing that may be obvious but I haven't mentioned yet is the battery. Check the posts on top to make sure they're clean (between the post and terminal) as well as the battery ground attachment. I cured a bunch of glitches by removing the ground cable bolt and cleaning under the cable terminal where it attaches to the body. I sprayed the connection with fluid-film to stop any further corrosion. This suggestion may seem a little archaic but try turning on the key and then tap on the relay, sometimes the contacts in the preglow relay just need a good smack .
__________________
1985 380SE- 160,000km 'Blistu' - Sold
1988 300CE- Eva,my garage mistress
2007 R350 4matic- The Black Pearl
2011 Ford Ranger-Work truck
1974 25' Trojan Sea Raider- 'Grannyknot'
2002 215 cm Atomic DH skis- Canadian SDH record holder, 175.5km/h- Vars 2010
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  #8  
Old 12-07-2003, 08:10 PM
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Location: Evansville, Indiana
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Very likely the fuse, the 300D did this to me last year. Also locked up the starter, but I don't think the two are related particulary!

Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #9  
Old 12-08-2003, 01:35 PM
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Fuse

Fues is melted, now how do you get a screwdriver in there to change it?

Can't find the only 90 degree one that I own.

Thanks.

Bernie
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  #10  
Old 12-08-2003, 07:38 PM
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Location: Evansville, Indiana
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I no longer remember how I got the fuse in and out. Can you unclip the relay from the fender maybe? I don't remember any difficulty.

My fuse was melted too, for whatever reason. Works fine now.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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