A damaged trailer-side 7-way RV blade plug can be replaced with a wired CURT pigtail harness instead of rewiring the entire trailer. CURT supplies standard 6-, 8- and 10-foot leads, retail-packaged counterparts and a cold-weather option. This guide compares exact model numbers so you can choose enough cable reach without confusing a trailer-side plug with a vehicle-side socket.
Cable length, packaging and cold-weather jacket
56601, 56602 and 56603 have 6-, 8- and 10-foot weather-resistant cables. The trailer-side male RV blade connector is moulded to the harness.
56621, 56622 and 56623 are CURT's packaged counterparts to the same three standard cable lengths. Packaging does not change the connector format.
56613 is the 10-foot cold-weather version available in this selection. CURT specifies a temperature range of -40°F to 221°F for these cold-weather models.
CURT trailer-side 7-way harness length comparison
These are trailer-side replacement leads: a moulded male RV blade plug at one end and colour-coded wires for splicing into existing trailer circuits at the other. They are not custom truck-bed extensions or vehicle-side connectors.
| Manufacturer MPN | Cable length | Cable type | Packaging | Connector |
|---|---|---|---|---|
| 56601 | 6 ft | Standard | Standard | Male 7-way RV blade / trailer side |
| 56602 | 8 ft | Standard | Standard | Male 7-way RV blade / trailer side |
| 56603 | 10 ft | Standard | Standard | Male 7-way RV blade / trailer side |
| 56621 | 6 ft | Standard | Retail-packaged | Male 7-way RV blade / trailer side |
| 56622 | 8 ft | Standard | Retail-packaged | Male 7-way RV blade / trailer side |
| 56623 | 10 ft | Standard | Retail-packaged | Male 7-way RV blade / trailer side |
| 56613 | 10 ft | Cold-weather | Standard | Male 7-way RV blade / trailer side |
The cold-weather 6-foot 56611 is a separate manufacturer model, but it is not part of this store's linked product selection.
Splicing and installation checks
Allow sufficient cable length for steering turns and trailer articulation without leaving a dragging loop. Protect splices against moisture, support the cable away from sharp edges, and test brakes, turn signals, running lights, reverse-light and auxiliary circuits as applicable.
CURT documents both traditional and SAE J2863 7-way RV blade colour/function arrangements. Verify the individual pin functions against the trailer's actual wiring rather than joining same-colour wires without testing. Disconnect electrical power before splicing and follow the connector installation instructions.
Some trailers use a 7-way round-pin connector rather than an RV blade connector. The pin and socket shapes differ and are not interchangeable.
CURT 7-way RV blade trailer-side replacement leads
Select the correct cable type and length below to see product details and availability.
CURT 56601
Six-foot trailer-side 7-way RV blade replacement lead with colour-coded wires and weather-resistant cable.
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CURT 56602
Eight-foot standard replacement lead for trailers needing more routing length than the 6-foot version.
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CURT 56603
Ten-foot standard replacement lead; check slack and wire routing before selecting.
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CURT 56621
Six-foot packaged counterpart to the standard 56601-style harness.
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CURT 56622
Eight-foot retail-packaged version of the standard trailer-side 7-way blade cable.
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CURT 56623
Ten-foot retail-packaged trailer-side replacement wiring harness.
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CURT 56613
Ten-foot cold-weather thermoplastic elastomer jacket rated from -40°F to 221°F by CURT.
View product details and availabilityRelated trailer wiring references
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