Speedo and gauges areout on 94 gmc instrument cluster. replaced cluster same problem with new one ,wiring problem?

Duplicated question

It looks to me you need a new or remanufactured cluster but ... find a wiring diagram for that cluster and with a test light checks the + wires(sometimes there is more than one +) and the ground on the wiring diagram. You will need to remove the cluster itself for the backprobe wire's test at the cluster terminals.

First have the computer scanned for trouble codes and as for the gauges first check the fuses and relays then if they are good then you will have to replace the instrument cluster because they are well known for being faulty.

You have so many problems but not much to work with. Let's try something to help you out.
1. Instrument panel is it Analog or Digital
2.For speedo and tach do you have a speedo cable attach to the cluster?
If it's with speedo cable. Inside the transmission, there is a plastic gear could be worn. And the cable at the cluster's end could be stripped or not install properly.
If it's with the digital cluster the speedo works with a buffer module near the glove compartment (It convert the analog signal to digital signal for a digital cluster.
I could tell you more but need too many info.
There is many instrument panel depends on the options.
See options: links

Hope it helps.




Find out instrument panel pinout (or electrical diagram) for wires testing.

1. There is more ground than only one and there more + wires at cluster panel. I will have to check those circuit and finally find the problem.

There is no speedometer cable on the 2003 Yukon, if there is no transmission issues like shifting problem. Your instrument cluster has gone bad, to pinpoint. Your stepper motor to your speedometer gauge has failed and needs to be replaced. You can do a search on Ebay for the stepper motor for around $10.00 which is better then the $400.00 cost of another instrument cluster.
There was a TSB on the replacement of the instrument cluster for your Yukon free of charge. The only cost to you is the labor charge unless your willing to do the job your self. Just go to the Gm Dealer and give them this TSB Number: # 07187C: Special Coverage Adjustment - Instrument Panel Cluster Gauge Needle Function - (Mar 20, 2009)
Subject:
07187C -- SPECIAL COVERAGE ADJUSTMENT - INSTRUMENT PANEL CLUSTER GAUGE NEEDLE FUNCTION
Models:
2003-2004 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT
2005 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT (U.S. ONLY)
2003-2004 CHEVROLET AVALANCHE, SILVERADO, SUBURBAN, TAHOE
2005 CHEVROLET AVALANCHE, SILVERADO, SUBURBAN, TAHOE (U.S.ONLY)
2003-2004 GMC SIERRA, YUKON, YUKON XL
2005 GMC SIERRA, YUKON, YUKON XL (U.S. ONLY)
Some customers of all 2003-2004 model year and certain U.S. 2005 model year Cadillac Escalade, Escalade ESV, and Escalade EXT; Chevrolet Avalanche, Silverado, Suburban, and Tahoe; and GMC Sierra, Yukon, and Yukon XL vehicles have reported that one or more of the instrument panel (IP) cluster gauges stick, flutter, or become inoperative. This may cause inaccurate readings, including the speedometer and fuel gauge. Special Coverage Adjustment This special coverage covers the condition described above for a period of 7 years or 70,000 miles (110,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership.
Dealers are to replace the instrument panel cluster after the condition has been verified. The repairs will be made at no charge to the customer.

For verified failures between 70,001 miles (110,001 km) and 80,000 miles (130,000 km) on U.S. vehicles, dealers are to provide the customer with an instrument panel cluster (IPC) only. Any additional costs, including labor to replace the instrument panel cluster, will be the responsibility of the customer. Dealers are responsible for the return of the customer's IPC back to the Electronic Service Center

Thank you for using fixya and good luck.

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Avalanche instrument cluster repair

If its still clocking up the miles then the speedo its self is faulty,Fit new ometer.Not senser.Good luck

Could be a bad cluster. If one is cable driven, and the other electric. You could have a bad speed sensor in the transmission which will make the speedo not work.

If this happened just after resetting, then the speedo gauge on instrument cluster is probably faulty.

When this problem happens you start checking the speed sender, then undo instrument cluster and check speed sender connector and voltages to instruments. If wiring are ok, then you replace the gauge.
In your case it is most likely the gauge.

One moment - just checking....