Before ordering a harness, you need to identify what connectors your truck uses. This guide covers every connector type across our three harness systems. Match what you see on your truck to the photos below, and you'll know exactly which options to select.
Important: OEM and updated connectors are not interchangeable. If you choose an updated connector on your harness, the mating sensor-side connector must also be the updated type. Make sure you identify what's currently on your truck before ordering.
Power Distribution Block (PDB) Connector
This connector determines which E4OD transmission harness you need. It's located under the hood at the Power Distribution Box (fuse box).
Applies to: E4OD Transmission Harness
How to check: Open the hood and find the Power Distribution Box (black fuse box on the driver's side fender). The transmission harness has a smaller plug going into the bottom or side of the PDB. Unplug it and count the cavities (slots) in the connector — not all will have wires. Count the total number of slots, including empty ones.
Photo: 4-Pin PDB Connector
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Smaller connector with 4 cavities arranged in a single row. Used on most F-350 trucks from 1994.5 through early 1997.
- Cavities 4 (single row)
- Vehicles F-350 (1994.5 – early 1997)
- SKU Code HVY
Photo: 8-Pin PDB Connector
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Larger connector with 8 cavities arranged in two rows of 4. Used on all F-250 trucks, and also on late-production 1997 F-350s.
- Cavities 8 (two rows of 4)
- Vehicles All F-250; late 1997 F-350
- SKU Code UDR
Late 1997 F-350 owners: Ford switched late-production 1997 F-350s to the 8-pin connector (originally an F-250 part) as part consolidation before the Super Duty platform. If you have a late-1997 F-350, don't go by the badge — check the connector. Not all cavities will be filled, and that's normal.
ICP / EOT Sensor Connector
The ICP (Injection Control Pressure) sensor connector determines which EOT/ICP module you need. The two types look different and are not interchangeable.
Applies to: 7.3L Engine Harness (EOT module selection)
How to check: The ICP sensor is located on the driver's side cylinder head, toward the back of the engine. Follow the wire from the sensor — the connector you're looking at is where the sensor pigtail meets the engine harness. Look at the connector shape and locking mechanism.
Photo: OEM ICP Connector (Metri-Pack 150)
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The original factory connector. Smaller profile with a flat, tab-style locking mechanism. This is what came on the truck from Ford.
- Type Delphi Metri-Pack 150
- Lock Style Flat tab / lever lock
- Choose if Your sensor has the original connector
Photo: Updated ICP Connector (GT 150)
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The upgraded replacement. Slightly bulkier with a more robust push-button locking mechanism and improved weather sealing.
- Type Delphi GT 150
- Lock Style Push-button / positive lock
- Choose if Your sensor has been upgraded to GT 150
These connectors are not interchangeable. A Metri-Pack 150 harness connector will not mate with a GT 150 sensor, and vice versa. If you want to upgrade from OEM to Updated, you'll need to change both the harness connector and the sensor-side connector.
EBP / Oil Pressure Sensor Connector
The EBP (Exhaust Back Pressure) and oil pressure sensors use the same connector family. Same deal as ICP — two types, not interchangeable.
Applies to: 7.3L Engine Harness (EBP module selection)
How to check: The EBP sensor is located on the exhaust up-pipe on the driver's side. The oil pressure sensor is on the engine block. Both use the same 3-way connector. Check the connector shape and lock style — it's the same OEM vs. Updated distinction as the ICP connector above.
Photo: OEM EBP Connector (Metri-Pack 150 3-Way)
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Original factory 3-way connector. Same Metri-Pack 150 family as the OEM ICP connector — flat tab lock, smaller profile.
- Type Delphi Metri-Pack 150 (3-way)
- Lock Style Flat tab / lever lock
- Choose if Your EBP/oil sensors have original connectors
Photo: Updated EBP Connector (GT 150 3-Way)
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Upgraded 3-way connector with better weather sealing and positive-lock mechanism. Same GT 150 family as the updated ICP.
- Type Delphi GT 150 (3-way)
- Lock Style Push-button / positive lock
- Choose if Your sensors have been upgraded to GT 150
UVCH (Under Valve Cover Harness) Connectors
This isn't about identifying what you have — it's about choosing what you want. The UVCH system determines how the engine harness connects to the injectors and glow plugs under the valve covers.
Applies to: 7.3L Engine Harness (UVCH module selection)
Photo: OBS UVCH System (4 x 5-Pin Connectors)
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The original factory setup. Four 5-pin connectors (two per valve cover) using 18 AWG conductors for glow plug relay circuits. These terminals are known to overheat and melt over time — the #1 failure point on the 7.3L.
- Connectors 4 x 5-pin (2 per head)
- GPR Wire 18 AWG (prone to melting)
- Gaskets Standard OBS valve cover gaskets
- Best for Keeping factory-original configuration
Photo: Super Duty UVCH System (2 x 9-Way Connectors)
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The upgraded system from the 1999+ Super Duty trucks. Two 9-way connectors (one per valve cover) using 14 AWG conductors for glow plug relay circuits. Eliminates the terminal melting problem permanently.
- Connectors 2 x 9-way (1 per head)
- GPR Wire 14 AWG (no melting issues)
- Gaskets Requires Super Duty valve cover gaskets
- Best for Long-term reliability — recommended
Which should you choose? If you're already replacing the harness, the Super Duty upgrade is the recommended option. It uses heavier 14 AWG conductors that won't melt, and it's actually less expensive than the OBS replacement because the connector system is simpler to build. The trade-off is you'll need Super Duty valve cover gaskets (available from HHC as an add-on or purchased separately).
Hard starting? If your truck cranks for a long time before firing — especially in cold weather — and your glow plugs, relay, and batteries test good, your OBS UVCH connector terminals may be burned. The 18 AWG GPR terminals overheat over years of use. The Super Duty upgrade solves this permanently.
Early vs. Late EOT/ICP Timing
Beyond the connector type (OEM vs. Updated), you also need to know whether your truck is an "Early" or "Late" build for the EOT/ICP module.
Applies to: 7.3L Engine Harness (EOT module selection)
How to check: Open the driver's door and look at the vehicle information sticker on the door jamb. Find the "MFR DATE" or "BUILD DATE" field. This tells you when your truck was actually built, which matters more than the model year.
Late 1994 – Early 1996 Build Date
Trucks built from late 1994 through early 1996. Uses the early EOT/ICP wiring configuration with a different pin arrangement than the late trucks.
- Build Date Late 1994 through early 1996
- Model Years Most 1995 and early 1996 trucks
- EOT Module EOT-E (OEM) or EOT-E-UPDT (Updated)
Late 1996 – 1997 Build Date
Trucks built from late 1996 through 1997. Uses the late EOT/ICP wiring configuration. Ford changed the pin arrangement mid-production during the 1996 model year.
- Build Date Late 1996 through 1997
- Model Years Late 1996 and all 1997 trucks
- EOT Module EOT-L (OEM) or EOT-L-UPDT (Updated)
Know What You Have?
Now that you've identified your connectors, find the exact harness that fits your truck.