SOLVED! GM Instrument Cluster Bench Test Harness ($35.00 + S&H)

mrrsm

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I've been spending that last day or so Beating The Living Hell out of an idea for making a GM Instrument Cluster Bench Test Harness to interface the "GYMKO" Tech2 Scanner for the purpose of Post Repair Testing of the Cluster Dial Sweeps and the Instrument Panel LEDs ...when I stumbled across THIS:

https://www.btdieselworks.com/products/instrument-cluster-bench-harness

There is an option at Checkout to purchase its own 12 VDC Power Supply, but that is easy enough to solve in so many other ways as well, Other than having a S&H Fee that is a bit steep at around $14.00 ... I doubt that I would have been able to do any better. While I can still use the "GYMKO" Tech2 Scanner to perform more extensive Tests of The Cluster if needs be by simply plugging it right back into the SUV Cluster harness Connector before completely assembling the components back inside of the casements... THIS handy thing will allow for Bench Testing it Before and After doing any repairs that will involve simple Repetitive Dial Sweeps and eye balling all of the Dash Light LEDs for proper working order...or burnouts... and NOT have to run back and forth to the Truck to perform these same tests:

These come in Two GM Flavors:

1999-2002
2003-2007
 

Blckshdw

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Nov 20, 2011
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The radio harness uses the same connector as the instrument cluster. So you can buy a replacement pigtail, and use that for your test bench. That's what I did years ago when I swapped LEDs into my cluster and wanted to be able to test it outside of the vehicle.

 

mrrsm

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Any Power Supply having 110-120 Volts AC In --> and 12 Volts DC Out @ 1 Amp will Suffice (fusing the Power In Wire with a 2 Amp fuse could not hurt) and you can add in a simple On/Off Toggle Switch if you wanted to get Fancy. Here is the Instrument Panel Cluster Connector Wiring Diagram linked above courtesy @Blckshdw:

2013-05-17_134312_clust.gif

Often... it can be Difficult to Confirm the Voltage Polarity on Common AC to DC Power Supplies. This Instructional Video shows how to sort that problem out using a Digital Multi-Meter AFTER Taping down the Two Leads from the PS to a piece of cardboard... lest they 'magically' touch each other while wrangling with the Red & Black Probes on the open copper wire ends. Label the (+) Wire afterwards if the PS is not being immediately soldered into the Connector Harness (+) Wire and (-) Ground Wire locations:

 
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Mooseman

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Dec 4, 2011
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Ottawa, ON
Or cheaper still, go to a pick-n-pull and get yourself some, likely for free. That's what I used. Get them for the radio, PCM, BCM, cluster, etc.
 

mrrsm

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This issue has been SOLVED.jpg over in THIS Thread:

 

Dexter7*7

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May 1, 2024
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Hello from a lately arrived student of GM Tech. I see this is an older thread, and I hope folks are still monitoring it.

I'm currently trying to build a Bench Test Harness to connect a Tech 2 to a 99 Sonoma IPC.
I have the IPC connector that came with it (from a pull & pay salvage) with a "pigtail" of about 1 foot length. I have a DLC and a 12 Volt power supply and this 24 pin connector to wire together.

I have seen two or three different pinouts for the 24 Pin IPC connector, having compared
a 1999 Olds Bravada with a 1999 GMC Sonoma IPC, and a 2004 Tahoe here in this thread.

There seems to have been some changes & additions to the pins and wires along the way.
New options over a range of year/model/options list, needing additional gauges and indicators.

Some have a Driver Information Center in the IPC (wired to some control buttons perhaps on the dash or on the steering wheel), a Tachometer, maybe even a Transmission Temperature Gauge. Others do not.

I'm hoping to get this 99 Sonoma IPC in the dash of my 2001 Chevy Astro, which by the way has a 22 Pin IPC connector. I'll have to either find existing wires or add wires to my Astro's wiring harness, to get everything working.

I'm looking for a very specific wiring diagram for a 1999 GMC Sonoma 2WD Pickup Instrument Cluster. Can anybody offer guidance? I did find the post with the link for Free GM Manuals and downloaded the 2002 files. I'm looking through them now, knowing they may or may not apply to a 99 'anything'. :blinkhuh:


Toggle Switch if you wanted to get Fancy. Here is the Instrument Panel Cluster Connector Wiring Diagram linked above courtesy @Blckshdw:

View attachment 93374

Often... it can be Difficult to Confirm the Voltage Polarity on Common AC to DC Power Supplies. This Instructional Video shows how to sort that problem out using a Digital Multi-Meter AFTER Taping down the Two Leads from the PS to a piece of cardboard... lest they 'magically' touch each other while wrangling with the Red & Black Probes on the open copper wire ends. Label the (+) Wire afterwards if the PS is not being immediately soldered into the Connector Harness (+) Wire and (-) Ground Wire locations:

 

Mooseman

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Dec 4, 2011
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mrrsm

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Your Very Best Option...is to Visit THIS eBay Listing for All Three 1999 GMC Sonoma Shop Service Manuals... and offer the Seller $75.00 for The LOT:


1999GMCSONOMAMANUALS1.jpg


"You Can't Make The SCENE... If You AIN'T Got The GREEN..." ---Stanley Ipsick--- (Jim Carrey) as "The MASK"
 
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Dexter7*7

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May 1, 2024
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Thanks for the links! The CHARM option is amazing! (I want to send them a donation!)
You just opened a door to a Vast Library of Service Manuals.

At present I only need wiring information: pin numbers, wire colors, circuit numbers, etc.

IF I had or considered buying a 99 Sonoma, the paperback Service Manuals would be a very good choice. I have the physical two volume FSM for my Astro Van.
 
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mrrsm

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Actually... @Mooseman deserves ALL of the Credit for that CHARM suggestion... and if the Mood Strikes You... and You can get your Creative Harness working to your satisfaction... GMT Nation has a Donation Feature available here too... So if you'd like to help to "Keep The Home Fires Burning" and the Lights On here at GMTN! Thanks!
 
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