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  #1  
Old 11-03-2005, 07:09 PM
Feelstranger
 
Join Date: Sep 2005
Location: Vermont
Posts: 52
Instrument cluster ground? 300D

Can someone tell me where the instrument cluster gets its ground? I found that If I manually ground the metal back of the cluster, my electrical problems with the fuel, temp, and other lights are resolved. But I don't see where the cluster is grounded from the wire diagram.
Thanks!

PS. anyone else ever make the mistake of opening the 14 pin plug? DOH!

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  #2  
Old 11-03-2005, 07:24 PM
RAYMOND485
 
Join Date: May 2005
Location: CALIF
Posts: 508
Ground For Instrument Cluster

1984 300d Turbo
Ground Is Behind Center Of Instrument Cluster Per Mercedes
Electrical Troubleshooting Manual May Be Loose Wire
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  #3  
Old 11-03-2005, 08:49 PM
Feelstranger
 
Join Date: Sep 2005
Location: Vermont
Posts: 52
Sorry, I was not clear. where is the connection on the instrument cluster? Is it one of the 14 in the 14 pin connector?
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Feelstranger
My Wheels
1991 Audi 200 20V Avant
1991 VW Westfalia Syncro/Audi I5
1983 Mercedes 300D turbo
1972 Kawasaki H1 500 Mach III
1970's Limongi/Campy road racing bike
1942 Old Town sailing canoe
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  #4  
Old 11-03-2005, 08:51 PM
John in Idaho
 
Join Date: Aug 2004
Location: Idaho
Posts: 5
On my '81 300TD, I pulled the instrument cluster and resoldered the main ground connection paths on the circuit board on the back. The solder joint was "cold" and the solder needed to be re-flowed to reliably be a good conducter. John in ID
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  #5  
Old 11-03-2005, 09:23 PM
Craig
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Posts: n/a
Quote:
Originally Posted by Feelstranger
Sorry, I was not clear. where is the connection on the instrument cluster? Is it one of the 14 in the 14 pin connector?
Yes, one of the wires in the round connector is the ground (brown wire). It goes to a ground point under the dash with several other brown wires. I would check that ground connection first.
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  #6  
Old 11-04-2005, 11:04 AM
Feelstranger
 
Join Date: Sep 2005
Location: Vermont
Posts: 52
Perfect. Thanks all. I dig in further tonight.
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Feelstranger
My Wheels
1991 Audi 200 20V Avant
1991 VW Westfalia Syncro/Audi I5
1983 Mercedes 300D turbo
1972 Kawasaki H1 500 Mach III
1970's Limongi/Campy road racing bike
1942 Old Town sailing canoe
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  #7  
Old 11-04-2005, 08:42 PM
Registered User
 
Join Date: Sep 2003
Location: France
Posts: 487
Quote:
Originally Posted by Feelstranger
Can someone tell me where the instrument cluster gets its ground? I found that If I manually ground the metal back of the cluster, my electrical problems with the fuel, temp, and other lights are resolved. But I don't see where the cluster is grounded from the wire diagram.
Thanks!

PS. anyone else ever make the mistake of opening the 14 pin plug? DOH!
hello feelstranger, what kind of problems do you have with your fuel pump and the loose grounding wire ? It may help understanding and solving stalling problem on my car! thanks in advance for reply.
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  #8  
Old 11-06-2005, 07:24 AM
Feelstranger
 
Join Date: Sep 2005
Location: Vermont
Posts: 52
No problems with the pump, just the gauge - it pegged full all the time, as did the temp gauge. Additionally, the glow plug indicator light was dim.

The problem turned out to be a clearly burned out section of the ground track on the circut board on the back of the fuel/temp gauge cluster. A little wire and solder and all is well. Only thing is I don't know what caused this melt down...
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Feelstranger
My Wheels
1991 Audi 200 20V Avant
1991 VW Westfalia Syncro/Audi I5
1983 Mercedes 300D turbo
1972 Kawasaki H1 500 Mach III
1970's Limongi/Campy road racing bike
1942 Old Town sailing canoe
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  #9  
Old 11-06-2005, 01:01 PM
Craig
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Posts: n/a
Quote:
Originally Posted by Feelstranger
PS. anyone else ever make the mistake of opening the 14 pin plug? DOH!
I did that once, it took a wiring diagram, two attempts, and about an hour to get it back together correctly. I believe I also said "DOH!" (or something similar) when all those wires fell out.

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