1997 7.3L Powerstroke Main Engine Harness
Replacement for F7TZ-9A451-CA / F7TZ9A451CA

Main engine wiring harness for late OBS Ford 7.3L Powerstroke trucks. Direct-fit, plug-and-play replacement for the factory engine harness.

Fitment

• 1997 Ford F-250 HD
• 1997 Ford F-350
• 1997 Ford F-Super Duty
• 7.3L Powerstroke DI turbo diesel only
• OBS body style only
• Federal / 49-state emissions
• Built before May 12, 1997
• Fits both automatic and manual transmissions
  • Automatic: E4OD
  • Manual: 5-speed
• Replaces F7TZ-9A451-CA and F7TZ9A451CA

Will Not Fit

• California-emissions trucks
• 1997 trucks built on or after May 12, 1997
• Early 1994–1996 trucks using F6TZ-9A451-F
• 1999–2003 Super Duty 7.3L
• F-150 or gas engines

What It Connects

Engine-mounted main harness with factory-style routing and connectors for:

• Injector solenoids under both valve covers
• Glow plug circuit and glow plug relay
• Engine sensors including ICP, EBP, EOT, and CPS
• Engine-to-chassis / firewall connector

This is the engine harness only. It is not the full chassis, cab, or IDM harness.

Typical Problems It Fixes

• Brittle, oil-soaked, or heat-damaged factory wiring
• Intermittent no-start or stalling
• Injector misfires and rough idle
• Sensor circuit faults
• Glow plug or starting issues caused by harness damage