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  #1  
Old 11-14-2003, 02:34 PM
PiP PiP is offline
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Join Date: Jul 2002
Location: Texas
Posts: 69
Glow Plug Relay (77 300D)

Hey gang, it has been a while since I have posted here.

We had major issues with the windshield install (took two months to get it fixed right).

But, not that we can drive the car again, it wont start.

Car has 5 new glow plugs, so it isnt that.
Battery is fully charged, so that isnt it either.

No voltage at the Strip Fuse.
So what is wrong?

How do I check the glow plug relay?

Thanks!

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  #2  
Old 11-14-2003, 08:04 PM
PiP PiP is offline
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Anyone know the answer?


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Old 11-14-2003, 10:32 PM
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Location: Evansville, Indiana
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Relay must click when you turn the key on -- you can check this with a helper. Should then click again after about 90 sec or so.

Check to make sure you have power to the relay (terminal 30) and that you get power to the output (strip fuse) after the relay clicks.

If it doesn't click, check the ignition switch wire (brown is a ground, one wire out is to the lamp, the other is the switch wire, don't know the colors off the top of my head). If you have hot there with the key on but no relay click, the relay is bad.

If it does click but you don't get any power to the strip fuse with power on terminal 30, the relay contacts are burned or loose, probably need a new relay.

I don't know which relay you have (this is a W123 correct?), so I don't know if you can get into it or not, but I've heard that water in the relay can corrode some of the traces on the circuit board, causing it to fail. Resolder the trace and it works again.

Otherwise, it's replacement time.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 11-15-2003, 03:58 AM
PiP PiP is offline
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Posts: 69
Thank you so much for the help Peter

I will test it tomorrow afternoon and post my results.

But of the top of my head the relay isnt clicking on, but the glow lamp does come on.
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  #5  
Old 11-15-2003, 10:51 AM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Yeah, even in Texas in the summer you will have trouble getting started without glowplugs, and in the winter it ain't gonna go without them, period!

Probably the relay.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #6  
Old 11-15-2003, 03:22 PM
PiP PiP is offline
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Join Date: Jul 2002
Location: Texas
Posts: 69
Yeah, it is 77 outside right now, and it still won't start. :p

I am buying a new relay from Philip, I sure hope this is the only problem for a while.

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