I've just ordered a conversion kit for my 76 300D (115). Does anyone know if the Bosch kit comes with instructions? If not, is it possible to wire these plugs into the existing circuit such that the glow plug light and ignition swith will function as before? I had to order an extra plug with the kit for all 5 cylinders, will I have to get any other parts for the kit to work on my 5 cylinder?

I've searched the forumn but can't find any specific instructions on this conversion.

TIA for the help,

David

I did the switch on a 78 240D. The kit inlcuded decent instructions, but will not directly plug into any harness. You'll have to do a little custom wiring. I did a write-up on it at http://home.comcast.net/~phantoms/vacuum/index.htm. Unfortunately, all the large pictures were lost on a server change over and I didn't have them backed up.

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85 300CD
83 300TD
78 240D (daughter)

Phantoms; is there a way you could post a larger version of the first image on your side here, tnx?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Sorry, as stated all the large images were lost on a server change. In fact, the whole page was lost and the only way it's there now is by the gracious help of users here who had archived it. The next time I'm around my daughter's car, I'll try to get some new pictures.

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85 300CD
83 300TD
78 240D (daughter)

Your going through a lot of trouble for nothing. You dont need to replace the ralay.

http://dieselgiant.com/mercedesdieselloopglowplugrepair.htm

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

Well, I hooked the plugs up to the existing relay, they glow fine but I still cant get the thing started. A little history:

My daughter drove this car all last year before leaving for college in August. It sat in our driveway for a couple months before I started it and took it out for an hour or so and filled up the tank with fuel. Car sat some more until December when my daughter came home for Christmas. I tried to start it for her but couldn't, I wrote it off to cold weather. Let is sit for a couple more months and tried to start again, found an open (old loop style) glow plug.
Converted to pencil style but still no start.

I've taken out a glow plug and grounded it and turned the key to the glow position and the plug gets red hot instantly so I'm sure I got good glow plugs.

What's an easy way to check if it's getting fuel? It seems just on the verge of catching sometimes but won't kick over. Is it possible the fuel's bad? How would I tell? This car ran great all last year for my daughter, I'm at a loss as to why it won't start now.

TIA,
David

Does anybody know if the relay from the 4 cylinder series plug system will be able to handle being converted to a 5 cylinder parallel system? I am putting a 5 cylinder engine in my 240 that was equipped with the loop style plugs. I am planning to do the upgrade following the instructions on dieselgiant's site, but do not want to fry my relay. Thank you.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

I cannot speak for a W115, but i did the conversion on my 79 W123. There are two ways to do it, 1) convert you series setup (79 W123) to a Series/Parallel set up, this is done by removing the old glow plugs/wires and Grounding strap and installing the new plugs with new fabricated jumpers wires to each plug( Leave the Grounding strap off the last plug off,Cyl #1). This method will improve your starting immeasurably. I drove around for months like this and it worked fine, The problem with this is the plugs go off when the engine starts.
With the new relay kit the plugs stay on for 3 minutes after engine starts and this smooths out the idle untill the car heats up, works great. Because you car has five cyls you have to order the extra plug and you will need a extra relay to work # 5 cyl i think the part # is 0 332 002 156.
Yes, the kit comes with instructions.
I hope this helps but remember mine is a 79 W123.

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1979 300D.

I ordered the additional relay and an extra glow plug. Is the addtional relay used in conjunction with the relay in the kit or does it replace the one in the kit? I received the kit today and the instructions don't mention how to wire it for a 5 cylinder.

Thanks for all your help

If you have a 5 Cyl, then its its for the extra cyl, are you sure there are no extra instructions for the 5th cyl???

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1979 300D.

Nope, no 5 cylinder instructions in the fast glow kit. Just 1 sheet with instructions in 8 languages.

The extra relay will arrive in a few days maybe it will have some instructions.

Thanks again,

The extra relay won't have the instructions, that relay has many use's, I bought mine from a solar power store. My bosch kit came with 2 sheets with 8 languages,one for the 4 cyl and one for the 5 cyl, i can fax you a copy or we will figure something else out. You will also need to pick up some small parts from your local parts store, 25 amp fuse fuse holder..... the paperwork tells you what you need. I also picked up a small enclosure to house all the components so they are protected from the elements, if i could figure out how to post photos on this site i would show you, if you like i could take a photo of the instructions and encloser and email them to you(PM your email only). Anyhow i can hear the Panzer calling me..it wants its injector pump.

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1979 300D.

i hope i can get some help with this. I got a 1975 300d and the last owner updated the glow plugs and fried a lot of wiring, it starts now with some late model glow timer and relay wired in. however the pre glow indicator light is totally fried the plastic is completely burned off. I want to replace this but I am unsure how to wire it and what to replace

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MAKDUFF3

1975 300D, Feuerrot and Parchment interior

1971 220D (RIP)

You may want to start a separate thread on this.....it sounds like the po connected the ground strap to the last plug, when it he wasn't suppose to....I don't know enough of the function of the w115 glow plug indicator, I would imagine you are going to have to get some used parts from a junkyard..

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How about a Pic of the Relay/Timer that is working.

You might check and see that the last owner did not substitute a higher Wattage Light Bulb into the GP Light.

You actually don't need the Glow Plug Light. It is just there to act as a Prompt for the Driver.
After you use what you have for a while you will learn to gestimate how long you need to preglow.

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84 300D, 82 Volvo 244Gl Diesel