can some one post some pics of the glow plug relay
i am trying to figure out what it looks like .
it is a 85 300d turbo diesel

It's the black box on the driver's side fender with two plugs and a strip fuse under the cover.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

Pre-glow relay
(Pics Below)

Attached Thumbnails

 

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'84 300SD sold
124.128

would a bad relay cause the glowplugs to not work and the glowplug light on the dash to not light up? the first start up of the day (morning) is usually really hard and . it will start and die as soon as i stop turning it over
but if i give it 1/4 to 1/2 throttle it will start. would this be cuased by glow plugs not working right

It could be a bad relay........or it could be two or three bad glow plugs. You'll need to make some tests with a ohmmeter and/or voltmeter to be sure.

Go to dieselgiant's website and follow the procedure for testing the glowplugs.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Follow the wires backward from the GPs to the box where they start.
The #2 GP has the light attached to it (I think) and it that wire isn't good
the light wont come on.
Listen for the click of the replay about 30 seconds after you turn the key
to the GP spot. If it doesn't click, it could be bad.

I just not two weeks ago changed out my GPs. Starts down to -3* now
without being plugged in.

MEter the plugs to see if they are even good. I had 4 bad plugs and my car
wouldn't start at all even on warm days without the GPs.

Good luck!

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Ginny in Denver-ish
78 300SD, 265K (mine)