A CURT in-bed wiring extension may connect behind the truck's original 7-way socket or plug into the exposed socket at the rear bumper. The two methods are not equivalent. Compare the factory connector, cable length and available bed-mounting space, then match the original CURT part number before replacing a harness.
Identify where the harness connects
56000, 56070 and the vehicle-specific 56001/56071, 57008/57010 products tee into approved factory wiring behind the original socket, keeping the rear bumper outlet connected.
56003 supplies both a 7-way RV blade and 4-flat connector at the bed location for selected Chevrolet/GMC trucks. It is not a standard single-output harness.
56080 uses an existing rear 7-way RV blade socket to route its seven-foot connection into the truck bed. Unlike the T-harness versions, it occupies the existing outlet connection.
CURT in-bed extension numbers and lengths
The manufacturer's application guide must confirm the truck year and factory tow package. Similar 7-way sockets alone do not prove that a rear harness uses the same OEM connector.
| MPN | Length | Connects at | Bed output | Application reference |
|---|---|---|---|---|
| 56000 | 10 ft | Factory harness T-connector | 7-way RV blade | Selected older factory-wired truck platforms |
| 56001 | 10 ft | Dodge/Ram-specific factory T-connector | 7-way RV blade | Selected Dodge Ram / Dakota trucks |
| 56003 | 7 ft | Factory harness T-connector | 7-way RV blade + 4-way flat | Selected Chevrolet/GMC pickups |
| 56070 | 7 ft | Factory harness T-connector | 7-way RV blade | Selected factory-wired truck platforms |
| 56071 | 7 ft | Dodge/Ram-specific factory T-connector | 7-way RV blade | Selected Dodge Ram / Dakota trucks |
| 56080 | 7 ft | Rear-socket extension | 7-way RV blade | Existing rear bumper 7-way RV blade socket |
| 57008 | 7 ft | Ford factory harness T-connector | 7-way RV blade | Selected newer Ford F-150 / Super Duty |
| 57010 | 10 ft | Ford factory harness T-connector | 7-way RV blade | Selected newer Ford F-150 / Super Duty |
Vehicle descriptions identify general product families, not universal fitment for all model years. CURT identifies 57008 and 57010 for selected newer Ford pickups with OEM 7-way wiring.
Before reusing or replacing a wiring extension
Examine the OEM harness locks and mating connector shapes, check for corrosion around the original socket and inspect the protective loom. Record the full extension length and whether the existing installation is a T-connector or rear-socket style.
57008 and 57010 include isolator hardware for relevant aluminum Ford truck beds. 56003 has a separate 4-flat output. 56080 connects to the rear 7-way socket instead of teeing behind it. These differences matter even if the bed-side socket looks similar.
Disconnect the vehicle battery when instructed by CURT, support all cable runs and test trailer lighting, brake-control and auxiliary circuits according to the truck and trailer instructions.
Find the matching CURT in-bed harness
Open the exact part number for current listing details and availability.
CURT 56000
Ten-foot in-bed outlet harness; requires the approved rear factory harness connection.
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CURT 56001
Dodge-specific version, not automatically compatible with other factory harnesses.
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CURT 56003
Dual-output 4-flat and 7-blade socket, different from single-output extensions.
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CURT 56070
Seven-foot packaged T-harness; adds a second bed-mounted socket.
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CURT 56071
Seven-foot Dodge-specific counterpart; inspect the original OEM connector.
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CURT 56080
Plugs into the exposed rear 7-way socket rather than teeing behind it; check routing and rear-socket availability.
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CURT 57008
Ford-specific seven-foot T-harness with mounting hardware and isolators for relevant aluminum beds.
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CURT 57010
Ten-foot Ford T-harness; includes isolator hardware for relevant aluminum truck beds.
Check exact listing and availabilityRelated trailer wiring identification
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