2004 GMC 2500 duramax
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=47001
Printed Date: November 26, 2025 at 9:29 AM
Topic: 2004 GMC 2500 duramax
Posted By: bjrose
Subject: 2004 GMC 2500 duramax
Date Posted: January 05, 2005 at 6:50 PM
does anyone have a wire diagram with wire sizes on it, there seems to be a couple wires the same color but different sizes. installing R/S.
Replies:
Posted By: sparkie
Date Posted: January 05, 2005 at 7:22 PM
Use a digital volt meter to verify the correct wires.
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sparky
Posted By: Hymer
Date Posted: January 05, 2005 at 7:48 PM
Red- +12v (two wires)14awg, pink ign 14awg ,White Ign 2, org accy 1 14aawg , brn accy 2 14 awg, yellow starter (some are 14 awg some deisels are 18 awg or smaller)every thing else is pretty much 16 ,18 awg I get the tach at the instrument cluster.
any questions just yell...
Hymer
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Tire Proz Stillwater Mn
High End Restyling and Comlete Repair
Posted By: bjrose
Date Posted: January 06, 2005 at 12:48 AM
Thanks I'll go on from there and get back if any problems. 
Posted By: KarTuneMan
Date Posted: January 06, 2005 at 8:33 AM
Just wondering if your refering to the 2 yellows in the IGN. harness? One is the starter, and the other is the passlock R code . Just use your DMM
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Posted By: bjrose
Date Posted: January 06, 2005 at 8:51 PM
What should DMM read and under what conditions: key in and on?
Posted By: Hymer
Date Posted: January 06, 2005 at 9:03 PM
The starter wire will read +12v when the starter is cranking the other is the Resistance for passlock II
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Tire Proz Stillwater Mn
High End Restyling and Comlete Repair
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