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Date: 10-13-05 04:26
From: Andrew
Subject: Okay, Instrument cluster circuit board question...  
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Does anyone have a schematic of the instrument cluster circuit board? I was having ground issues with my temp gauge so I added another ground...now however I am running into what seems to be results of redundant grounds, or "grounding loops" as they are called.
I want to break the original ground connection in the cicuit board and use the newly added strong ground instead.
Any ideas???
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Date: 10-13-05 05:18
From: Curtis A. Ingraham
Subject: Blue Repair Manual has a simplified schematic of the cluster...
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Once you get that, maybe you want to find and fix the poor ground, as it may affect other circuits in the cluster?
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Date: 10-13-05 05:27
From: Andrew
Subject: Blue manual? Like "THE" BMW shop manual?(nt)
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(nt)
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Date: 10-13-05 05:53
From: Curtis A. Ingraham
Subject: Yes, that one. Check all the wiring diagrams there for the one...
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with the clearest illustration of the cluster wiring.
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Date: 10-13-05 06:59
From: Jerzy
Subject: Brown is ground in the German wiring world.
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Schematic shows pin #5 of the main instrument cluster connector is terminated with a brown/ground wire.
What makes you think you have a ground loop problem?
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Date: 10-13-05 08:44
From: Andrew
Subject: Thanks, I'll investigate(nt)
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(nt)
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Date: 10-14-05 05:30
From: mike
Subject: Easy way to ground the two "problem child" gauges (temp & fuel)...
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1. remove cluster
2. locate the little brass nuts that hold the two gauges to their mounting board; remove one nut from each gauge.
3. solder up a "Y" shaped wiring harness with a ring terminal on each short leg of the Y, and a spade terminal on the long leg. Put one ring terminal under each stud, replace the nut. Find a convenient screw behind the instrument cluster, attach a male spade terminal under the screw, and fasten the remaining terminal on your harness to it. Grounding problem solved. Be sure to make the "Y" harness long enough so you can disconnect it next time you remove the instrument cluster...
cheers
mike
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Date: 10-14-05 11:19
From: JimK
Subject: Ground
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In '72 I grounded my temp gauge to the ground pin on the instrument cluster ground pin (at the harness connection) instead of running the ground off somewhere. Reliable since and I can pull the cluster without other wires hanging around.
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