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  #1  
Old 12-24-2013, 04:07 PM
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no glow plug 1982 300d

so i have 1982 300d.
its been working great
went out to day to start
its 20° out
no glow plug light
now it wont start...


hmmmm
try to hand pump the fuel
but i imagine that doesn't really help if the glow plugs aren't working
any idea...maybe the GP relay went?

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  #2  
Old 12-24-2013, 04:13 PM
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Err nevermind. Got my years mixed up. 1980 was the transition year. You should have the pencil style plugs. I'll let someone more familiar with that style chime in!
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  #3  
Old 12-24-2013, 04:57 PM
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Do you get any light from the glow plug light? If not, I would guess two or more of your plugs are TOAST!
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Old 12-24-2013, 05:04 PM
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Rule #1

Check the strip fuse in the relay..
They are known for hair line cracks..

Then start your diagnosis..

Glow plugs link thread

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  #5  
Old 12-24-2013, 06:14 PM
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where is the relay?
seems weird they would die all of asudden.
i had the monovalve apart trying to fix the heat...
i couldnt have messed anything up there could have i?
i jsut took out the 4 screws and looked at it for corrosion etc.

Last edited by minsk; 12-24-2013 at 06:57 PM.
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Old 12-24-2013, 07:16 PM
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The pic is of an SD, but in the same location and the same part.

The top pops off, you'll see a strip fuse.
Attached Thumbnails
no glow plug 1982 300d-screen-shot-2013-12-24-7.14.42-pm.jpg  
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  #7  
Old 12-24-2013, 07:47 PM
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It is either the strip fuse or bad glow plugs.
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  #8  
Old 12-24-2013, 09:10 PM
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strip fuse is definitely good.
looks new.
there are not other fuses in the main fuse box that contorl the glow plugs correct?
i was replacing fuses in the main for for heat etc.

Last edited by minsk; 12-24-2013 at 09:22 PM.
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  #9  
Old 12-24-2013, 09:13 PM
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Quote:
Originally Posted by minsk View Post
strip fuse is definitely good.
looks new.
there are not other fuses in the main fuse box that contorl the glow plugs correct?
Correct. Did you have the key on for a long time without starting? I have done this when cleaning my car or something I left the key on on but did not start the car for some time and ended up killing my glow plugs. That happened twice with old plugs.

Check the plugs.
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  #10  
Old 12-24-2013, 11:54 PM
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Quote:
Originally Posted by minsk View Post
strip fuse is definitely good.
looks new.
there are not other fuses in the main fuse box that contorl the glow plugs correct?
i was replacing fuses in the main for for heat etc.
Did you check to see if you are getting power to the glow plugs?
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  #11  
Old 12-25-2013, 01:30 AM
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How old is the battery? A cold morning can really tell you if its time to get a new battery....so far here, the first cold day of the year....I find my self exchanging my battery for a new one...
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  #12  
Old 12-25-2013, 05:16 PM
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left coast.
i have not
my multi meter is across town.


what should the reading be?
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  #13  
Old 12-25-2013, 08:55 PM
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Well, it's difficult to test out electrical circuits without some kind of a tester. Even a simple test lamp will enable you to tell whether or not you have power to the plugs, and you can test them all in less than a minute. You've probably already skimmed through the links provided by WHunter, and I'm sure that somewhere in them is a more complete set of instructions, so I'll spare the details here.

As stated, verify that the fuse is good first. Don't rely on a visual check. Confirm that there is power at the load side of the fuse, then do the same at the plugs themselves. No power at the plugs means that you can start working your way back towards the power source. The standard Bosch plugs are supposed to require 11V. I've seen readings .3V lower on a perfectly functioning system, so ymmv. Main thing is that you're getting some power there, verifying that the relay and harness are working order and isolating the problem to the glow plugs themselves. You can then move on to checking the glow plug resistances to find the bad one(s). This is a quick and dirty method for diagnosis, but if you see a plug show one ohm or higher resistance, then that plug is most likely bad. Infinite resistance indicates that the plug is bad. The typical handheld VOM or DVOM can't really deliver the accuracy to verify proper resistance at the level of a fraction of an ohm, so a suspect plug needs further testing, but it will sure as hell be accurate enough to identify a plug that has burned out completely. Check the harness as well, although it is far less likely that you have a bad lead. If you have the time, you can just pull them all, apply 12V straight from the battery, and visually check each one. This is the surest way to verify that they are or are not working properly.
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  #14  
Old 12-25-2013, 11:30 PM
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ok so i did all the tests.
i think.
went and got my multimeter..
freind took me on xmas day
thank god for freinds


when i turn power on the relay clicks
so power at the relay box..
checked the terminals etc
12v

took off the cap and measured ohms on each port
3 had zero
i believe 2 had 3ohms
also put the meter on the actual nut connector at the glow plugs

im going to replace all the glow plugs.
hopefully i can get them locally.

will just one non functioning one make the glow plug light not to come on?
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  #15  
Old 12-25-2013, 11:35 PM
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Using the newer relay....yes only one working plug would cause the light to not come on....

make sure you get bosch plugs...

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