Is the timer for the glow plugsd integrated into the gp relay assembly? I'm using a 616 in my project and would like to use the mercedes gp relay. Lets see if I have this correct... main 12V power supply going into the relay, large plug going out to the glow plugs themselves, and a smaller plug coming in from the ignition. It's this small plug that has me confused - Where is the timer that actually shuts off the GP light on the dash and cuts power to the gp's? Or is that strictly determined by the sender on the head located between the #1 and #2 gp's? OR is there a seperate timer assembly located under the steering column kick panel of the wrecked 240D that the motor came out of that I missed removing?

My goal would be to turn the key in my truck to the "on" position, providing 12V the the GP relay, wire up a light on my dash (HOW, by the way, does the light get wired into the system???!!!), wait for the properly wired light to go out, then hit my seperate starter button to activate the starter. Does this sound like it is doable??? Being that I have the mercedes gp relay assembly and all connectors, I'd like to use that system instead of going to a manual system using a Ford-style starter solenoid on a seperate circuit using a manual push-button switch and relay.

What do you think?

Thanks! With all this help, it should hopefully be running soon in its new home...

The purpose of this timer, is to represent a moment of silence, in honor of Rudolph Diesel...Not really any other reason to wait for glow plugs. The whole warming up the combustion chambers thing is a myth..Just to insure, the moment of silence is actually taken by all who own them..LOL.

thanks for the info...

While that may be true, if I was to wire up my gp's in the way that I described (via my existing ignition key - not using a momentary switch on a seperate circuit), what will stop the gp's from being lit the WHOLE time? What will shut them down after start-up?

They automatically shut off the moment you use the starter by the same voltage signal that activates the starter. If you don't use the starter, the timer also stops the glowplugs after about 1 minute.

that's good to know. But where is the timer? Is it integrated into the gp relay found on the left fender? And like I asked at the top of the thread, what is the specific purpose of the smaller of the two plugs that lead into the relay (where do the wires run?)?

I would wire a manual push-button connected to a relay that powers a light in the cab and the glow plugs, rather than use the MB relay. My GP relay stuck on a few days ago and drained the battery. I plan to wire up a Glow plug on Light this weekend.

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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

Well, as much as I had it in my mind to use the original relay, I've had an overwhelming amount of people recommend a manual system. I suppose, for simplicity sake, that I'll go that way.

What kind of relay should I hunt down at NAPA? Something like forcedinduction's set-up? Where/what form 80amp fuse would be recommended?

"I use a manual setup. I got an 80amp continuous-duty relay from NAPA for about $30."

Make sure the relay is continuous duty rated for at least 80 amps or more.

Here is the perfect fuse holder.
http://www.vteworld.com/content/electromech/fuse/html/anl/anlfuse.php

Can answer MB's only. The relay under hood, the "other" plug is connected to timer. Don't know where it's located. Early models had relay under dash.

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83 SD

84 CD

I guess I've decided to go with a seperate circuit for the plugs using a push button switch. However, after asking the very knowledgable techs at MBI in Portland today, they confirmed that the timer is integrated in the relay box itself... the smaller plug goes up to the ignition switch and the light on your dash.

another feature of the MB GP relay is that it won't light the GP light in the dash if a GP is burned out. With a jerry-rigged setup you'll only know a GP is burned out when it's harder to start.

Since you are putting so much effort into this project I would use the MB GP relay.

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