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  #1  
Old 03-03-2004, 05:34 PM
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300 Sdl Gp

Hey guys, just joined. I Heard about this board from another member. I am having a problem with my inlaw's 86 300 SDL. When you turn the ignition on the light for the glowplugs does not illuminate and obviously the glow plugs do no turn on. I know(from reading prior posts on this forum) there is a relay with a fuse in it. I suspect one of these to be the culprit but as I do not have a shop manual for this car I do not know where to find it. Could anybody give me a hint of where to look? If I find the fuse or relay to be bad are they something I can find at a local part store? Any help would be appreciated. Thanks

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Old 03-03-2004, 05:37 PM
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Before you do that, tap on the dash where the light is. Mine just quit working a few weeks ago, but I did not notice a difference in starting. Tapped on the dash and the next time it came on. It has done that twice now.
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Old 03-03-2004, 05:42 PM
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Actually the glowplugs themselves do not come on, therefore the car will not start.
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Old 03-03-2004, 05:49 PM
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Somebody will come along who knows the answer, but if you're in a rush (you seem to be sitting there waiting ) and the car is there, then start pulling plastic covers off of stuff in the engine bay. It should be something about the size of a pack of cigarettes, and you can follow the glow plug wires to it. There's a metal strip inside held down with two screws. Careful - one end is energized all the time! Loosen the screws to check as they can be cracked and still appear good.
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Old 03-03-2004, 05:53 PM
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nevermind
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  #6  
Old 03-04-2004, 01:35 AM
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OK found the module when I got home. 80 Amp fuse is good, no clicking sound from the module when I turn the key on. I am going to write this off as a bad module. Thanks for the help!!
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Old 03-04-2004, 01:45 AM
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Check the fuse carefully it may just be cracked and not melted. If cracked nothing in the glow plug system will work. This is a common problem. If it is not cracked then it could be a fuse in the fuse panel. Just to the right of the brake booster. The black square box. Unscrew the two large knobs and remove the cover. check all fuses.

Dave
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Old 03-04-2004, 03:06 AM
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do u live in missouri? i told some guy to log on here and help who also has a 86 300SDL. so just wondering.
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Old 03-04-2004, 12:23 PM
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rc51jim,

If the GP relay doesn't click, it is either the relay itself or a bad connection someplace between the Relay and the key switch, or possibly even the key switch itself. This clicking has nothing to do with the fuse in the relay.

With the key turned to the glow position, try removing and reconnecting the small connector on the Relay 5 to 10 times and listen for the relay to click. This solved my GP not working problem because there was corrosion on the contacts between the relay and the connector.

If the above doesn't work, before replacing the relay, I would determine if it is getting voltage when the key is turned. If not getting voltage, a new relay will not solve your problem.

P E H

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