Trailer Wiring Harness Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Trailer Wiring Harness sales on Amazon US totaled 40,400 units in July 2026 (▲ 1.3% vs. the prior month), generating an estimated $760,361 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 54.5% of unit volume and 38.3% of revenue, while a typical listing is priced at $23.62. The keyword itself pulled 22,934 Amazon queries over the same period (▲ 1.3% MoM).
Zooming out to the 12-month window ending July 2026, the trailer wiring harness Top 50 moved 365,750 units and $7,054,563 in cumulative sales — an average of 30,479 units and $587,880 per month. Monthly throughput topped out at 40,500 units in April 2026 and dipped to 19,700 in December 2025, leaving the latest reading 22.4% higher than August 2025.
Trailer Wiring Harness Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
40.4K
▲ 1.3% MoM
Monthly Revenue 2026/07
$760.4K
▼ 0.1% MoM
Top 10 Market Share 2026/07
54.5%
Trailer Wiring Harness Market Share & Sales Concentration on Amazon US — July 2026
The most-sold trailer wiring harness listing on Amazon US in July 2026 is ASIN B08MDW63DH (Brand: Oyviny), which sold 6,000 units at $13.99 apiece — equal to 14.9% of every unit tracked in this report and 2.0× the volume of the No. 2 listing.
The Top 10 ASINs account for 22,000 units and $291,100 in July 2026 — 54.5% of unit volume and 38.3% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Trailer Wiring Harness' on Amazon
July 2026
Is 54.5% Top 10 share highly concentrated?
Ask AI to evaluate competition, market structure, and entry opportunities using ’s tracked Amazon sales, ranking, and keyword data.
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Top 5 Volume Share breakdown
B08MDW63DH
Oyviny 7 Pin Round to 4 and 5 Pin Flat Blade Trailer Adapter, 7 Way to 5 Way Trailer Plug Adapter 2-in-1 Design
6K
▲ 0.0%vs. prior month
$83.9K
latest month
12-month trend
B008CE0W5Y
MAXXHAUL 70205 Trailer Light Kit - 12V All LED, Left and Right Waterproof Submersible for Trailers, Boat Trailer Truck Marine Camper RV Snowmobile, Red
3K
▲ 0.0%vs. prior month
$78K
latest month
12-month trend
B0C85Z9VDJ
MECMO RV 7 Pin Trailer Plug Splice-in Replacement Trailer Side Male End 7 Way Round RV-Style Trailer Light Wiring Harness Connector, Heavy Duty 7 Prong Trailer Wiring Tow Plug for RV Boat Trailer
3K
▲ 0.0%vs. prior month
$27K
latest month
12-month trend
B071ZPX32N
Nilight - NI -WA 06 LED Light Bar Wiring Harness Kit - 2 Leads 12V On Off Switch Power Relay Blade Fuse for Off Road Lights LED Work Light, 2 Years Warranty
2K
▲ 100.0%vs. prior month
$21.7K
latest month
12-month trend
B0DFGSDWRM
22FT 4 Pin 5 Wire Trailer Wiring Harness with Nylon Net Tube Guard | Utility Pure Copper Boat Trailer Wiring Kit for Trailer Tail Light Rewiring, Waterproof 4 Pin 5 Wire Trailer Connector
2K
▲ 100.0%vs. prior month
$15.6K
latest month
12-month trend
B0B19GHHW8
MECMO 4-Way Flat Trailer End Connector 25 Inch, 16AWG 4 Prong Trailer Wiring Harness Plug with Dust Cover, Trailer-Side 4-Pin Trailer Light Plug Male End Replacement Connector for Trailer Hitch Wire
2K
▲ 0.0%vs. prior month
$18K
latest month
12-month trend
Unlock to view all Top 50 ASIN competitors and their sales contributions
Best Trailer Wiring Harness Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Oyviny is the best-performing trailer wiring harness brand in July 2026, moving 6,000 units across 1 ASIN for 27.3% of Top 10 volume. MECMO follows with 5,000 units (22.7%), ahead of MAXXHAUL on 3,000 units (13.6%).
With 9 brands splitting the Top 10 and 63.6% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $8.99 to $25.99, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Oyviny
1 ASIN in Top 10
27.3%
Units
6K
Revenue
$83.9K
Avg. price
$13.99
B08MDW63DH
$13.99·★4.7·2.6K revsOyviny 7 Pin Round to 4 and 5 Pin Flat Blade Trailer Adapter, 7 Way to 5 Way Trailer Plug Adapter 2-in-1 Design
Units sold6K
MECMO
2 ASINs in Top 10
22.7%
Units
5K
Revenue
$45K
Avg. price
$8.99
B0C85Z9VDJ
$8.99·★4.7·748 revsMECMO RV 7 Pin Trailer Plug Splice-in Replacement Trailer Side Male End 7 Way Round RV-Style Trailer Light Wiring Harness Connector, Heavy Duty 7 Prong Trailer Wiring Tow Plug for RV Boat Trailer
Units sold3KB0B19GHHW8
$8.99·★4.8·640 revsMECMO 4-Way Flat Trailer End Connector 25 Inch, 16AWG 4 Prong Trailer Wiring Harness Plug with Dust Cover, Trailer-Side 4-Pin Trailer Light Plug Male End Replacement Connector for Trailer Hitch Wire
Units sold2K
MAXXHAUL
1 ASIN in Top 10
13.6%
Units
3K
Revenue
$78K
Avg. price
$25.99
B008CE0W5Y
$25.99·★4.6·18.4K revsMAXXHAUL 70205 Trailer Light Kit - 12V All LED, Left and Right Waterproof Submersible for Trailers, Boat Trailer Truck Marine Camper RV Snowmobile, Red
Units sold3K
Trending Trailer Wiring Harness Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B09N97CPQS booked 1K units at $8.99, with ▲ 11.1% MoM change. On the growth side, B0BQM6YMMS leads positive momentum with ▲ 200.0% MoM growth on 300 units, with B071ZPX32N close behind at ▲ 100.0% MoM on 2K units.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B09N97CPQS
25ft 4 Wire 4-Flat Trailer Light Wiring Harness Extension Kit, Trailer Wiring Harness with 18 Gauge White Ground Wire for Trailers O-016
Price
$8.99
Rating
4.7
Reviews
1.2K
Latest month sales
B0BQM6YMMS
Gonice 25Ft 4 Pin Trailer Wiring Harness Extension Kit, 4-Way Flat Plug, 5-Wire Male & 4-Wire Female Connector with 18 Gauge White Ground
Price
$9.99
Rating
4.6
Reviews
977
Latest month sales
B071ZPX32N
Nilight - NI -WA 06 LED Light Bar Wiring Harness Kit - 2 Leads 12V On Off Switch Power Relay Blade Fuse for Off Road Lights LED Work Light, 2 Years Warranty
Unlock to view ASIN details and product titles
Price
$10.79
Rating
4.6
Reviews
31.6K
Latest month sales
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