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Your search for "trailer wiring adapter" revealed the following:

12-1/4" Electric Trailer Brake Adjuster Cable Kit Right Side 8k-10k 12k 15k (K71-505-00)
12-1/4" Electric Trailer Brake Adjuster Cable Kit Right Side 8k-10k 12k 15k (K71-505-00)
$55.21
R4CD
4 Way Round Pin Female Truck Plug, Metal Casing (R4CD)
$11.28
100- 14" Zip Tie Strap Wire Harness Screw Anchor Hole Mount Base Cable Attaching (LPC-44SMB)
100- 14" Zip Tie Strap Wire Harness Screw Anchor Hole Mount Base Cable Attaching (LPC-44SMB)
$14.99
Brophy 7-Way RV Blade to 5-Way Flat Trailer Adapter | Reverse Lockout Support (F75FB)
Brophy 7-Way RV Blade to 5-Way Flat Trailer Adapter | Reverse Lockout Support (F75FB)
$17.29
Pollak 7-Way RV Trailer Connector Socket — 7 Circuit Round - With Bracket (12707 + BKU7)
Pollak 7-Way RV Trailer Connector Socket — 7 Circuit Round - With Bracket (12707 + BKU7)
$21.99
F7DC
7 way trailer truck plug, rubber gasket & bumper mount (F7DC)
$12.71
R7CD
Truck End Plug 7 Way Pin RV Connector Light Plug for Cord Wire Camper Semi (R7CD)
$14.33
7 Way Plug Holder Stay-Put Trailer Camper RV Boat Tow Ready Mount Electrical (BKP7)
7 Way Plug Holder Stay-Put Trailer Camper RV Boat Tow Ready Mount Electrical (BKP7)
$6.80
Brake Controller Kit Non Application Specific Hard Wire Vehicle End Trailer (IYOBC-KIT)
Brake Controller Kit Non Application Specific Hard Wire Vehicle End Trailer (IYOBC-KIT)
$64.59
Add Trailer Brakes Kit – 3500 lb Axle, 5 on 4.5 Bolt Pattern, Electric Self-Adjusting, Import, Complete Kit (94545-B-FSA-IMP-K1)
Add Trailer Brakes Kit – 3500 lb Axle, 5 on 4.5 Bolt Pattern, Electric Self-Adjusting, Import, Complete Kit (94545-B-FSA-IMP-K1)
$225.96
7 Way RV Trailer Plug Connector Truck End Female Side (12-707)
7 Way RV Trailer Plug Connector Truck End Female Side (12-707)
$17.99
7-Way RV Blade Plug, Pre-Wired Junction Box, 6 ft Arctic-Grade Cord (J-JB-6FT)
7-Way RV Blade Plug, Pre-Wired Junction Box, 6 ft Arctic-Grade Cord (J-JB-6FT)
$54.99