Need Tach wire, 05 Diesel Sierra

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=61276
Printed Date: April 28, 2024 at 11:48 PM

Topic: Need Tach wire, 05 Diesel Sierra

Posted By: durango02
Subject: Need Tach wire, 05 Diesel Sierra
Date Posted: August 13, 2005 at 3:31 PM

I am having trouble finding the tach wire for the 2005 diesel Sierra. DIRECTWIRE says it is white @ PCM pin 10 (I believe, paper is out in garage) but I can not locate it. Bulldog says it is @ PCM and instrument cluster pin A5. I can't seem to find the instrument cluster and if I did, there is not a white wire in pin A5. Thanks for your help.

Replies:

Posted By: kgerry
Date Posted: August 13, 2005 at 4:04 PM

grab it at the cluster, trust me it's there...use a meter not a cheat sheet... you have to diode isolate and grab your glow plug connection there anyway....

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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979

Posted By: extreme1
Date Posted: August 13, 2005 at 10:25 PM

I havn't ever had to diode the wait to start in a GM?

but yeah, it's the white wire at the instrument cluster harness, wait to start (for all the 2 seconds it is) is dark blue

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Shaughn Murley
Install Manager, Dealer Services
Visions Electronics
Red Deer, Alberta

Posted By: durango02
Date Posted: August 13, 2005 at 11:41 PM

Thanks, I found it using my DMM but for some reason the RS was not picking it up, so I ended up using the voltage setting.

Posted By: dare_ds69
Date Posted: August 15, 2005 at 6:34 AM

Tachometer	white	ac	instrument cluster, pin A5 or PCM
Notes: The PCM (Powertrain Control Module) is in the left front of the engine compartment to the left of the fan shroud. On gas models, the tach wire is in the green plug, pin 10. On diesel models, the tach wire is in the gray plug, pin 37. On hybrid models, the tach wire is in the green plug, pin 35. For tach can also go to any of the ignition coils or fuel injectors and use the wire that is NOT pink, black, or brown.
Wait to start	dk. blue	-	instrument cluster, pin A2 or PCM
Notes: The PCM (Powertrain Control Module) is in the left front of the engine compartment to the left of the fan shroud. The wait to start wire is in the blue plug, pin 26.

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how own your mind, control your life.
MECP certified. always use a DMM

Posted By: Chris Luongo
Date Posted: August 15, 2005 at 6:42 PM

No need to waste your time fishing wires out under the hood and digging aroud the PCM.

1. Move tilt wheel all the way down.

2. Set parking brake.

3. Place transmission in the lowest gear.

4. Pull the dash bezel off with your hands (no tools required).

5. Remove four 7mm screws that hold the instrument cluster. Pull the cluster; there is a good amount of slack on the wire.

6. On gas trucks, tach is the only white wire in the cluster harness. I don't see any reason it wouldn't be there on diesels.

Posted By: dare_ds69
Date Posted: August 16, 2005 at 6:52 PM

this easy look and learn posted_image

as you see at the right is the cluster, and at the left is the vents there is only one white wire posted_image

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how own your mind, control your life.
MECP certified. always use a DMM

Posted By: durango02
Date Posted: August 16, 2005 at 9:41 PM

Thanks for all your help guys, but like I said, I found it at the PCM and the Instrument cluster but for some reason the Remote start would not see it, so I used the voltage sensing option. I know this is not the best way to do it, but it is an option that works and it still has some mode of safety.

Posted By: durango02
Date Posted: August 16, 2005 at 9:41 PM