need electrical help (pinout) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dark Knight · 10-31-2012, 05:28 PM

Does anybody out there have a pinout for the instrument cluster connector on a 91-94 truck? Preferably 91. I think 88-90 might serve my purpose too. The deal is, everything works on my cluster, with the exception of tach and speedo. I swapped in a known good cluster and the speedo still does not work. I would like to know which wires on the connector are supposed to be hot with the ignition on. Everything worked before, but I swapped a 5.3 in this truck and removed the ECM and all wires related to the TBI system. I'm thinking I might have cut a power wire going to the instrument cluster...

scotts62 · 11-02-2012, 06:48 PM

This may help, http://www.gmtruckclub.com/forum/sho...#axzz2B6mHZO00

ChevyTech · 11-02-2012, 09:03 PM

The instrument panel in 1991 is not like any other. (91 connects the same way as 88-90 and has the speed sensor buffer circuitry built in, but has a very slightly different pinout than 88-90.

1988-1990 = same
1991 same connector as 1988-1990 but some wires in different positions
1991 (mid year?) some late module year 1991 trucks had the needle style gauges but no separate DRAC.
1992 – 1994 instrument panel is interchangeable
1992-1995 The DRAC is separate from the instrument panel.
1996 the DRAC is built into the PCM

I had saved links many sites with information on these instrument panels, but the links no longer work. The sites on this topic had many errors in them. I believe the people pulled the sites because they realized how many errors there were. Most of the errors were on DRAC information & DRAC calibrating. I have critiqued them in the past, either at this site, or at Chevytalk.org.

Dark Knight · 11-03-2012, 11:22 AM

Thanks for the help guys. I appreciate it. However, I found the problem on my own. I simply spliced the wires going to the VSS input on the 5.3 ECM backwards. Haha. Swapped them around and everything works perfectly!

Posted via Mobile Device

10-31-2012, 05:28 PM	#1
Dark Knight Registered User Join Date: Dec 2008 Location: Pleak, Texas Posts: 420	need electrical help (pinout) Does anybody out there have a pinout for the instrument cluster connector on a 91-94 truck? Preferably 91. I think 88-90 might serve my purpose too. The deal is, everything works on my cluster, with the exception of tach and speedo. I swapped in a known good cluster and the speedo still does not work. I would like to know which wires on the connector are supposed to be hot with the ignition on. Everything worked before, but I swapped a 5.3 in this truck and removed the ECM and all wires related to the TBI system. I'm thinking I might have cut a power wire going to the instrument cluster... __________________ -1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too) You've gotta be able to stop and steer before you can go fast!

11-02-2012, 06:48 PM	#2
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,240	Re: need electrical help (pinout) This may help, http://www.gmtruckclub.com/forum/sho...#axzz2B6mHZO00 __________________ Scott 93 crew cab build Project 62

11-02-2012, 09:03 PM	#3
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: need electrical help (pinout) The instrument panel in 1991 is not like any other. (91 connects the same way as 88-90 and has the speed sensor buffer circuitry built in, but has a very slightly different pinout than 88-90. 1988-1990 = same 1991 same connector as 1988-1990 but some wires in different positions 1991 (mid year?) some late module year 1991 trucks had the needle style gauges but no separate DRAC. 1992 – 1994 instrument panel is interchangeable 1992-1995 The DRAC is separate from the instrument panel. 1996 the DRAC is built into the PCM I had saved links many sites with information on these instrument panels, but the links no longer work. The sites on this topic had many errors in them. I believe the people pulled the sites because they realized how many errors there were. Most of the errors were on DRAC information & DRAC calibrating. I have critiqued them in the past, either at this site, or at Chevytalk.org. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.

11-03-2012, 11:22 AM	#4
Dark Knight Registered User Join Date: Dec 2008 Location: Pleak, Texas Posts: 420	Re: need electrical help (pinout) Thanks for the help guys. I appreciate it. However, I found the problem on my own. I simply spliced the wires going to the VSS input on the 5.3 ECM backwards. Haha. Swapped them around and everything works perfectly! Posted via Mobile Device __________________ -1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too) You've gotta be able to stop and steer before you can go fast!



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.