80 300d gp light flashes 30 times?

So far, I have installed 5 new gp's and a new 80 amp fuse strip. Wiring looks ok. Is there a way to test the relay to see if its bad?

Any tips or suggestions would be appreciated.

i have never heard of the light flashing....

i would think that the relay must be whacko, u are definately looking in the right direction.....

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After you start the car? That means that one of your glow plugs is bad... er... at least it thinks one is bad.

Seems to be common on the 116 diesel. My 79 does the same.

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Sounds like a bad ground to me. Anytime something flashes on and off, or works intermittently I check the ground first.

A couple of weeks ago I was having problems with my GP light no comming on at all, but the plugs where heating up. I found it to be a burn circuit on the back of gauge. I soldered it up and it works great.

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Ok here is the latest.

As I mentioned before I just installed 5 new gp's about 2 weeks ago.

This morning I went a tested the gp wiring and gp's along with the relay voltage. I followed Dieselgiants write up that is posted at

http://dieselgiant.com/glowplugrepair.htm DG, Thanks for the great info

gps and wiring tested ok but I had high readings at relay plug hole 6 and 8

these correspond to what appear to me as temp sensors on the side of the block in line with the gp's

the front one between gp 1 and 2 had an ohm reading of 3.2 and the mid back one between gp 2 and 3 was around 0.7. my meter reads dead nuts on so no correction factor was needed

another question is: on the relay connection block the front sensor has a designation of "NTC" and a number 8 and the mid back sensor has a "B" and a number 6....what does the "NTC" and "B" stand for?

I don't have a wiring diagram handy, but, NTC stands for "Negative Temperature Coeficient", meaning a thermistor (temperature sensing component).

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



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HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

Never seen a "glowplug gauge"

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Do you think the high reading on the NTC could be causing the light to flash to warn me of a gp circuit issue?

Depends on the design of the circuit. The resistance of the device changes with temperature. Current is supplied to the device and a voltage, which varies according to the resistance, is monitored and a comparator circuit will perform some action at some certain voltage level designed into the circuit. Generally, these kinds of sensors are very reliable, (although 20 year old connectors may not be reliable). Usually if you apply heat to the sensor and its resistance changes it is OK. The hard part may be locating the sensor.

Sorry I can't give a better answer, but I am not familiar with the GP circuit design, just speaking in general terms.

__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

Not a bad idea to open up your relay and look for loose solder joints...I found several on mine on the high current pads....just re-touch with good hot iron and quality rosin solder ...that seemed to do it on my 240D....If I remember right the temp sensors are one for the glow plug relay timer, and one for the dash panel temp gauge....I think the relay temp. sensor tells it how long to glow depending on head temp...

Good advice on the resolder of the relay "guts". I had an issue with an OPV on a 94 E320 and the smae trick worked for me.

The GP light, the seat belt light, and all the other lights on the bottom of the intrument cluster and grounded through the gauges. So when I lost the original gound on my cluster I lost ground to all the lights. No ground no light. I fixed the burned spot, and the light worked again.

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I should have mentioned that about half of the relays on my 27 year old 240D had solder joints getting loose...I have gone through every relay and aluminum box with electronics in it I could find...and about half of them needed re-soldering....especially the so-called warning device box under the dash and the hazard light box on the console....that little chore fixed all kinds of things.....If I remember correct the two temperature sensors on the head are the same....glow plug timer and temp gauge.... you can switch the wires between the two and they still work the same if both of them are good...that is how I found I had a bad wire to my gauge rather than the sensor.... the problem stayed with the switched wire and not the sensors....turned out to be a bad connection on the female contact clip that attaches to the sensors....once again...more solder........

Took the relay apart on Friday afternoon and found no apparent solder breaks.