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Your search for "trailer wiring harness" 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
Trailer Breakaway Battery Brake Kit 12V Charger & Switch Electric Break Away (J-BRTK)
Trailer Breakaway Battery Brake Kit 12V Charger & Switch Electric Break Away (J-BRTK)
$48.99
Pair 12-1/4" x 3-3/8" Hydraulic Brake Assemblies – 8K – Left and Right (77-1208H-1P)
Pair 12-1/4" x 3-3/8" Hydraulic Brake Assemblies – 8K – Left and Right (77-1208H-1P)
$266.78
HL35-LOTOF2
TWO - 3/8" Heavy Duty Safety Chain Forged Hook Trailer Camper RV 16,200# (HL35-LOTOF2)
$90.99
1536182
2000# Trailer Axle Brake Backing Plate Mount Flange 1-1/2" center hole axel (1536182)
$17.99
Hydraulic Brake 12"x2" Passenger Side Right w/Nuts, Bolts, and Washers (BPH-7000-RH) Complete Backing Plate
Hydraulic Brake 12"x2" Passenger Side Right w/Nuts, Bolts, and Washers (BPH-7000-RH) Complete Backing Plate
$75.99
VAL2150BKBU
Valterra Lockable Black Electrical Power Outlet Hatch RV Trailer Camper Travel (VAL2150BKBU)
$17.59
White 12 LED Utility Cargo Light RV Camper Trailer 800 Lumens W/ Switch (E18-LCS0-1)
White 12 LED Utility Cargo Light RV Camper Trailer 800 Lumens W/ Switch (E18-LCS0-1)
$17.98
Innovative Step Light Surface Mount Blue 5-LED 35" Lead Truck Trailer RV (006-2200-1)
Innovative Step Light Surface Mount Blue 5-LED 35" Lead Truck Trailer RV (006-2200-1)
$21.54
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
Demco Universal Trailer, Towing, Break-Away Cable, Locks Brakes When Decoupled (05408)
Demco Universal Trailer, Towing, Break-Away Cable, Locks Brakes When Decoupled (05408)
$25.99
Dexter-Compatible Electric Brake Kit — 12-1/4" × 5" — 12K–15K Axles — 4 Plates (BK-12KHDE-SET2)
Dexter-Compatible Electric Brake Kit — 12-1/4" × 5" — 12K–15K Axles — 4 Plates (BK-12KHDE-SET2)
$544.06