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#1
08-25-2008, 06:35 PM
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79 300D glow plug issues/not starting
I've read a few horror stories from people who have created more work for themselves unwittingly. I think I can safely join those ranks now. The other night after doing a valve adjustment, purge, filter change, and finally installing a new idle cable, I accidentally left a deep socket on top of the throttle linkage that must have fallen down between the injection pump and valve cover when I shut the hood. When I turned the key to preglow, there was arcing and a pop under the hood and I quickly turned the key off and opened the hood to fine wisps of smoke.
I am not an electrician at all. I hate electricity with a passion. I just can't understand it like fuel or water flow. I found a fuse on the firewall that is just before the glowplugs. It's an 80 amp strip fuse and I already ordered more. In the meantime though I went to advance auto and found another 80 amp fuse (it doesn't matter what type of fuse it is does it??) and replaced the blown one. Now, when I turn the key to any position nothing happens whatsoever. I even tried jumping it and charging it over night. When the fuse is hooked up, the battery is constantly draining about 0.01 Volts every 3 seconds. Is this normal? When I disconnect the fuse, all my accessories work and the battery seems to hold a charge. This is a good 'titanium' battery less than a year old and the alternator is only 2 months old. I have looked through other blogs and found a lot about the glow plug relay which I think is under my dash in this car. I can't figure out which relay it is under there however. Could this be the culprit even though the 80 amp fuse blew? I do have a multimeter but I don't really know how to use it well. I would really appreciate any help. My wife and I really do like our cars but lately its just one problem after the next and we are starting to lose heart. Thank you, Brandon and Megan Oswald Pensacola, FL 1979 300D 1985 300D Turbo 
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#3
08-26-2008, 01:23 AM
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Glow plug misery
Now would be a good time to put in a full manual control of the glow plugs....If you just don't like voltage ,current,ohms and watts....this is the way to go....I have a 1979 300D and switched it to the parallel glow plugs with a manual switch and it cranks like a new one now....
Lots of info on the forum about this simple mod.....best way to go for pure reliability.....you probably need a fast start anyway to scoot away from those little cyclones that love to chew up the coast down there..... That deep socket is a heavy duty fuse...gonna have to pull some serious current to pop that thing...!
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1978 Yellow 300D (The Mustard Toad) 1980 Blue 240D (The Iron Toad) 1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad) (Open the pod bay doors HAL) Last edited by yellit; 08-26-2008 at 01:26 AM. Reason: more info
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#4
08-26-2008, 12:50 PM
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The glow relay under the dash above the drivers legs might have welded the contacts with the high current surge before the fuse blew. Thats if it blew. I would take the relay apart and see if I could separate the contacts and dress the points a little.
Another thought was does the 79 with series plugs take a fifty or eighty amp fuse? Thats if you still have the squiggly wires between glow plugs indicating it is series type. Try to remember this episode was not really the cars fault. Making the frustration probably even greater I realise. We probably all do something or other once in awhile though. I know I do. Perhaps an unstable socket can take the heat. . Last edited by barry123400; 08-26-2008 at 12:55 PM.
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#5
08-26-2008, 02:58 PM
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glow relay
Thanks Barry! I've been under the dash for 20 minutes now trying to figure out which relay under there is the glow relay. How do I tell? It's impossible to trace the wires and I don't want to touch anything that I shouldn't.
There is a big silver box under there in the middle below the steering column that looks like it could be it. How do I take it apart? It looks to be a 1 piece design where only the end comes off. Thanks again, Brandon
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#6
08-26-2008, 03:10 PM
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it's the relay that's on top of the steering column a REAL bear to remove...
so do you still have squigly wires between the glow plugs, or do you have insulated wires looped to the fuse on the firewall? since you have an 80A fuse, you should be running parallel plugs, but it's hard to tell from this end of the computer.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#7
08-26-2008, 03:47 PM
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pencil glow plugs
I have the pencil type plugs but they are in series with straight, thick red wires between. I think this is peculiar because every other car of the same year (1979 300D) has the loop style in series with the zig zag connections. The car was wired like this when I bought it in February but I haven't had anything go wrong until I accidentally forced it to go wrong.
Do you think I shouldn't have the 80 amp fuse? Is it worth my time to pull that relay out like Barry mentioned above? Thanks a lot, Brandon 1979 300D 1985 300D Turbo
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