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#1049929 - 04/14/17 12:19 AM Loose Gauge Connections....  
Joined: Mar 2017
Posts: 98
longislandcamper Offline
Member
longislandcamper  Offline
Member

Joined: Mar 2017
Posts: 98
Port Jefferson Station, NY
Sometimes my gauges work and sometimes they don't. I'll just be driving around and some work. Next time I look the gauges that were working are not working and the ones that weren't working were working. Then I'll look later and they're all working before they take turns not working again. lol

How can I get better connections behind my gauges?

#1049965 - 04/15/17 12:00 AM Re: Loose Gauge Connections.... [Re: longislandcamper]  
Joined: Jan 2000
Posts: 3,653
mmc427ss Offline
15+ Year
mmc427ss  Offline
15+ Year
Member

Joined: Jan 2000
Posts: 3,653
Pottstown, Pa
First place to check is the 18 pin plug located between the cluster and dash. It is located at the lower right corner of the cluster.It is not accessible without removing the cluster. Careful press on the that corner to see if the gauges respond with the engine running, you could also pull on the same location to see if the gauges drop out. If the tach and cluster lights work all the time then it's not likely a ground problem, as every component in the cluster shares a common ground. The oil, temp, and fuel gauges are #2, 3, 4 in that plug, it's possible that plug isn't making good contact in that area.
Bob

#1049997 - 04/15/17 11:49 PM Re: Loose Gauge Connections.... [Re: longislandcamper]  
Joined: Mar 2017
Posts: 98
longislandcamper Offline
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longislandcamper  Offline
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Joined: Mar 2017
Posts: 98
Port Jefferson Station, NY
All of my gauges worked to and from work today. Maybe the warmer temps helped make a better connection due to things expanding.

#1050001 - 04/16/17 01:38 AM Re: Loose Gauge Connections.... [Re: longislandcamper]  
Joined: Dec 1999
Posts: 11,137
86ttop Offline
15+ Year
86ttop  Offline
15+ Year
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Joined: Dec 1999
Posts: 11,137
Brooksville, Fl
As these cars have aged and endured many heating and cooling cycles, the gauges become very tempermental, Bob is right on the money about what he posted above, good luck!!



Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1050055 - 04/17/17 12:40 PM Re: Loose Gauge Connections.... [Re: longislandcamper]  
Joined: May 2009
Posts: 1,665
Richie Cat Online content
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Richie Cat  Online Content
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Joined: May 2009
Posts: 1,665
Lake Ronkonkoma, N.Y.
I help a member with his gauges. Found the 18 pin connector had broken one of it's retaining clips that hold it in. Got a replacement connector and swapped the wires into it.


83 SC, 355 w/TPI
#1050058 - 04/17/17 01:30 PM Re: Loose Gauge Connections.... [Re: longislandcamper]  
Joined: May 2016
Posts: 271
Witness86SS Offline
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Witness86SS  Offline
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Joined: May 2016
Posts: 271
Hatfield, PA
Working on gauge problems myself here. How do you disconnect the cable from the back of the speedometer?

I'm pretty sure I got every screw but I still could not pull the gauge assembly out. I think that cable was holding me up.

I cleaned up all the contacts on the 18 pin connector and the 4 center gauges, but now my gauge problems are worse. only the fuel gauge works.

Any guides for what type of voltage or resistance I can check on the 18 pin connector and the actual gauge contacts or the gauges themselves?


Justin
1986 Black SS
350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler
#1050064 - 04/17/17 03:53 PM Re: Loose Gauge Connections.... [Re: longislandcamper]  
Joined: Feb 2016
Posts: 32
zelm86ss Offline
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zelm86ss  Offline
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Joined: Feb 2016
Posts: 32
Bremen,In
I had a problem with the fuel gauge in my car. I found the printed circuit on the back of the instrument cluster was bad. If you can't find the fault in the connector,look for cracks in the printed circuit . If nothing is found,plug in the cluster and wiggle/move the circuit. If the gauges work when it's moved and the wire harness is good (no loose connections or a intermittent open) then the printed circuit is bad.

#1050066 - 04/17/17 05:28 PM Re: Loose Gauge Connections.... [Re: longislandcamper]  
Joined: Jan 2000
Posts: 3,653
mmc427ss Offline
15+ Year
mmc427ss  Offline
15+ Year
Member

Joined: Jan 2000
Posts: 3,653
Pottstown, Pa
On the back of the speedo is a "press to release". Press toward the speedo head and hold down, the cable can then be pulled out of the speedo. Will also need to disconnect the plug for the VSS from the speedo also, the plug is held to the speedo with a small hex screw, maybe 5 mm or so, can't remember size exactly.
There is only one ground for the cluster, if open the gauges, tach and dash lights won't work.

The general rule I use if only one gauge is bad then it's could be a defective gauge, printed circuit for that gauge and lastly the connection for that gauge on the 18 pin connector. If all gauges are an intermittent problem go to the 18 pin connector first. If nothing works in the cluster either it's a bad ground or no 12VDC supply.
Bob


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