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Your search for "brake controller harness" revealed the following:

Multi-Tow 7 Blade to 4 Flat Trailer Plug Adapter - Hopkins - OEM Tow Package Wiring Harness Connector (40974)
Multi-Tow 7 Blade to 4 Flat Trailer Plug Adapter - Hopkins - OEM Tow Package Wiring Harness Connector (40974)
$19.99
Add Brakes – Manual Adjust • 7,000 lb Trailer Axle Kit 12" x 2" Electric Brakes • 8 x 6.5" Hub/Drums • 1/2" Studs (92865-B-IMP-F-KIT)
Add Brakes – Manual Adjust • 7,000 lb Trailer Axle Kit 12" x 2" Electric Brakes • 8 x 6.5" Hub/Drums • 1/2" Studs (92865-B-IMP-F-KIT)
$369.95
58" Electric Park Brake Cable goes with 21-15858700 Main Cable Sloans Kwik Load (21-15656003)
58" Electric Park Brake Cable goes with 21-15858700 Main Cable Sloans Kwik Load (21-15656003)
$74.99
Caliper, Disc Brake, 3.5K-6K Axle, Mounting Bracket 77-3.5KI-DBB and Rotor 77-3.5KI-RTR-102 ( 77-3-6K LB)
Caliper, Disc Brake, 3.5K-6K Axle, Mounting Bracket 77-3.5KI-DBB and Rotor 77-3.5KI-RTR-102 ( 77-3-6K LB)
$98.56
23-439
12.25" x 4" Brake Back Plate Self Adjust Trailer Right Side 10000 Heavy Duty Cap (023-439-00)
$460.90
Add Trailer Brakes Kit – 3500 lb Axle, 5 on 4.5 Bolt Pattern, Hydraulic, Import (94545-B-IMP-HYD)
Add Trailer Brakes Kit – 3500 lb Axle, 5 on 4.5 Bolt Pattern, Hydraulic, Import (94545-B-IMP-HYD)
$208.59
3,500 lb Trailer Electric Brake Complete Conversion Kit - 5x4.75" GM Bolt Pattern (945475-C-IMP)
3,500 lb Trailer Electric Brake Complete Conversion Kit - 5x4.75" GM Bolt Pattern (945475-C-IMP)
$252.99
12.25 X 5" Blue Wire Electric Brake Magnet Kit Backing Plate Shoe Right 12K 15K (K71-502-MAG)
12.25 X 5" Blue Wire Electric Brake Magnet Kit Backing Plate Shoe Right 12K 15K (K71-502-MAG)
$229.82
Add Brakes & Hub/Drum Kit – 7,000 lb Trailer Axle – 12" x 2" Electric Brakes – 8 on 6.5" – 1/2"-20 Studs (92865-B-IMP)
Add Brakes & Hub/Drum Kit – 7,000 lb Trailer Axle – 12" x 2" Electric Brakes – 8 on 6.5" – 1/2"-20 Studs (92865-B-IMP)
$349.95
12-1/4 Electric Trailer Brake Adjuster Cable Kit Left Side 8k-10k 12k 15k (K71-504-00)
12-1/4 Electric Trailer Brake Adjuster Cable Kit Left Side 8k-10k 12k 15k (K71-504-00)
$46.89
Tie Down Safety Pin Cable fits Models 70 Master Cylinder DISC Brake Actuator (47256)
Tie Down Safety Pin Cable fits Models 70 Master Cylinder DISC Brake Actuator (47256)
$32.95
Hub & Drum, 12K, Rockwell, 12.25" x 5", 8 x 6.5, 2 Piece, 5/8" Stud, 4.75" Pilot, Gray With Bearings and Cap (912865-1475-KIT)
Hub & Drum, 12K, Rockwell, 12.25" x 5", 8 x 6.5, 2 Piece, 5/8" Stud, 4.75" Pilot, Gray With Bearings and Cap (912865-1475-KIT)
$620.39