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#1
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Gauge Cluster Issues
While troubleshooting a different problem, I had my gauge cluster out and apart. I've put it back together wrong, apparently. New issues: Gauge lights don't work. Fuel gauge pegs at full on startup, and temp gauge goes to full within a minute or two of starting. High beam indicator stays on. Other info: The rheostat has a jumper soldered across it. There is also a jumper from the rheostat to the #3 pin on the round electrical connector to work around a bit of the PCB that flaked off years ago. I originally installed it years ago, and it came off as I was pulling the cluster. I got Pin 3 based off a post I saw on this site, but I'm not sure that's correct.
What did I do wrong? Edit: The patient is the '83 300D in my signature.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. Last edited by Skippy; 03-21-2021 at 10:56 PM. |
#2
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You may have put the 15 pin plug in wrong and shorted some stuff. It's a keyed plug, but it does happen. Or your ground might be wonky now after this last cluster R&R and may need a new ground cable from the cluster to the ground behind the dash.
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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
#3
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I'd consider having the keyed connector in wrong unlikely. However, the ground thing sounds quite plausible. What are some good places to connect an auxiliary ground?
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#4
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Proper Grounding
Use an part of the body, use a star typ lock washer under the nut and ring lead .
German cars use brown wire for grounds .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
#5
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I have seen where the keyed part of the plug had broken off making it very easy to misalign the connector.
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags |
#6
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X2
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#7
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The D-shaped key was still there when I had it apart last, and I didn't have to use much force to get it in. We'll see when I take it apart this weekend. I do wonder how a ground issue could result in the high beam indicator being on, albeit too dimly to see it during the day.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#8
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One way to test out the cluster ground circuit is to use a long test cable. Connect one end to the battery grnd point the other end would go to the grnd point on the wiring harness. Using a continuity meter will verify the wiring harness grnd point to the cluster. If the key "D" shaped connector is still connected to the plug then I can't see how this would cause a problem.
MB's have a funky issue with with grnd circuits. In electricity devices will seek the least resistant path to ground and can take out other circuits in the process. Please don't ask how I know this...... |
#9
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multi plug
Any good .W123 diesel
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#10
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Poor Grounds & Current Backflow
" I do wonder how a ground issue could result in the high beam indicator being on, albeit too dimly to see it during the day."
It glows because the indicator lamp is providing a poor ground path . Like the millions of old 50's & 60' GM products that have a dim taillight that goes out when you step on the brake : the secondary filament provides a ground path until you energize that circuit then the light goes out . Auto electrics isn't rocket science, you just need to learn it by doing, you'll get this fixed ere long .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
#11
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Where on the cluster?
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#12
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Any screw on the speedometer.
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#13
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I'll try that.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#14
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Binnacle Ground Connection
I'd take a photo and post it if it wasn't so god damned difficult to do so, it used to be simple, now it's almost impossible to upload any attachments .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
#15
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It seems to have worked. The fuel gauge is now reading a plausible value instead of pegging full. I'd take it for a test drive, but I'm going to walk over and grab a pambazo first. It will be a few hours before it's dark enough to tell if I fixed the dash lights. I may work on the Jag a little bit.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
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