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Visit my Facebook page for a lot of New Pictures & Harness Guides  - E-Mail: brendan@lt1swap.com

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.

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.

 

STOCK HARNESS

STOCK HARNESS

STOCK HARNESS