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Visit my Facebook page for a lot of New Pictures & Harness Guides YouTube channel for How To videos - E-Mail: firstname.lastname@example.org
2004 5.7L LS1 GTO Specific Wiring Harness information. This year GTO used cable throttle.
2004 5.7L LS1 GTO Wiring Schematics
2004 5.7L LS1 GTO PCM Pinouts - Includes highlighted pins for removal, and those to keep for external connections. PDF FILE
2004 5.7L LS1 GTO Harness Pictures - I've got some modified wiring harness pictures some place, will get them added when I find them.