F81Z-12B637-FA | 2002–2003 7.3L Power Stroke

Engine wiring harness for 2002–2003 Super Duty trucks with the 7.3L Power Stroke diesel. This is the main engine harness that feeds injectors, sensors, glow plugs, the PCM, and related engine-bay circuits. Built to original specs for correct connectors, routing, and plug-and-play fit on the right vehicle.

A worn or chafed 7.3 harness can cause hard starts, misfires, stalling, glow-plug faults, and intermittent sensor codes. Replacing it with the correct harness assembly restores factory electrical integrity instead of chasing one broken circuit at a time.

Replaces
F81Z-12B637-FA • F81Z12B637FA • 12B637 • SWF-12B637 • 1837761C91 • P659932

Fits these vehicles

• 2002–2003 Ford F-250 Super Duty — 7.3L Power Stroke (Automatic Transmission, Federal Emissions)
• 2002–2003 Ford F-350 Super Duty — 7.3L Power Stroke (Automatic Transmission, Federal Emissions)
• 2002–2003 Ford F-450 Super Duty — 7.3L Power Stroke (Automatic Transmission, Federal Emissions)
• 2002–2003 Ford F-550 Super Duty — 7.3L Power Stroke (Automatic Transmission, Federal Emissions)

Required configuration

• 7.3L V8 Power Stroke diesel only
• Federal emissions only (glow plug relay style)
• Automatic transmission (4R100)
• Direct replacement when the original harness is F81Z-12B637-FA

How to confirm fitment
To confirm fitment, remove your PCM (main computer) from your truck. Confirm top left of barcode has DPC-462 as your PCM number. We currently do not offer a manual transmission engine harness.

Specifications

• OE Fitment wire assembly
• Base number: 12B637
• Fitment type: Direct replacement
• Condition: New
• Warranty: 1 Year

OE style connectors and routing. Order only if your truck matches the Federal / automatic application above.

We do not accept returns on this product.