glow plug resistor on 73 220d - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 10-22-2012, 12:57 PM Thread Starter
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glow plug resistor on 73 220d

I am having issues starting my 220d cold. it seems as though there is excess resitance in the glow plug circuit.
Yes I did take electrical readings and I found that the voltage reaching the first plug in the series (cyl. 4) is reading 9. something V, battery voltage being about 12.2v. I proceeded to measure the voltage drop between plug #1 (cyl 4) and battery positive and I got 1.something volts.

Sounds to me like my glow plug resistor aka saltshaker needs to be changed
it also never seems to glow as bright as it should.

is there any other thing that might cause this? I looked at the wiring diagram and it seems pretty straightforward to me.

All comments and insights are very much appreciated, Thank you!
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post #2 of 10 (permalink) Old 10-22-2012, 01:12 PM
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Could be that the battery isn't so good anymore. Have you measured the voltage of and at the battery during preglowing? 12.2V is pretty low for a battery in rest.

Check also for dirty connections and/or bad ground connection.

The salt shaker is least likely to fail, as it isn't exposed to combustion.
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post #3 of 10 (permalink) Old 10-22-2012, 10:40 PM Thread Starter
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its a brand new battery but the car has sat for over two months so i ll have it charged and check that braided ground wire, seems a little frayed.. i l report back thank you
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post #4 of 10 (permalink) Old 10-23-2012, 12:24 AM
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Also check/clean the ground wire from battery to car.
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post #5 of 10 (permalink) Old 10-24-2012, 07:18 AM Thread Starter
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so far..

I have replaced the frayed braided ground wire with a solid wire well crimped and connected, and I also had battery charged to 12.7v when glowing the input voltage seems to be about 10.39v so there still appears to be a huge voltage drop somewhere between the battery and the first glow plug.

I will check the battery ground wire. however i have new positive terminal and cable, I have experienced where the 2nd 220d i owned wont start because of bad battery terminals!!

I ll report back.
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post #6 of 10 (permalink) Old 10-24-2012, 07:37 AM
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And how is the voltage on the battery (measured at the battery) during preglowing?
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post #7 of 10 (permalink) Old 01-22-2013, 04:11 PM
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Quote:
Originally Posted by Govert70227 View Post
Also check/clean the ground wire from battery to car.
hello, i am having trouble starting my 220d as well in my case however i have a good battery but have no power whatsoever.i believe it has to do with the ground wire off the neg terminal, i would guess that it goes strait to the body but instead it connects to a few other wires behind the headlights and runs along the radiator to i dont know where. if i touch the wire to the body i get my headlights etc. but as soon as i try to glow my plugs i get a spark and everything dies. i have no clue whats going on and my car is stuck in my work parking lot. if you have any insight i would greatly appreciate it.
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post #8 of 10 (permalink) Old 01-24-2013, 10:07 AM Thread Starter
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get a new ground cable that connects from the battery to the chassis, clearly you don't have grounding. when i bought i first non running 220d that was why it would not start.
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post #9 of 10 (permalink) Old 01-24-2013, 10:10 AM Thread Starter
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@ govert (battery Voltage)

Battery voltage measured during preglowing was 9.8- 11.5 it was less than 12v
Does that mean that the battery isnt good? this was bought new within the past year...
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post #10 of 10 (permalink) Old 01-24-2013, 11:09 AM
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get a new ground cable that connects from the battery to the chassis, clearly you don't have grounding. when i bought i first non running 220d that was why it would not start.
that was exactly my problem. it looks like someone has messed with the wiring in the past. once i replaced the ground wire it fired right up.

thanks for all the help!
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