Trailer wiring
Miady trailer wiring adapters and testers
No model matches all of these filters. and the list comes back.
A 7-way cord with a junction box, a 7-blade to 4-flat adapter, a 7-pin tester and SAE leads. Start with the tester when the trailer lights act up.
Side by side
Miady trailer wiring adapters and testers compared
| Fact | Miady 7-Way Inline Trailer Cord with Junction Box$26.99 | Miady 10 Gauge SAE Quick Disconnect Harness, 5-Pack$13.74 | Miady 7-Pin Trailer Wiring Tester$8.79 | Miady 7-Blade to 4-Flat Trailer Adapter$8.78 |
|---|---|---|---|---|
| Colors | One color | One color | One color | One color |
| Rating | 4.6 of 5 (1,191) | 4.7 of 5 (785) | 4.5 of 5 (318) | 4.6 of 5 (137) |
Truck socket, trailer plug and the cord between
Most trucks with a tow package have a round 7-way blade socket, and plenty of small utility trailers still wear a 4-way flat plug. Our 7-blade to 4-flat adapter sits between the two, so you tow without cutting or splicing anything. Before you blame a bulb, plug the 7-pin tester into the truck socket and switch on the lights. Six labeled LEDs show which circuits answer: tail, brake, reverse, left turn, right turn and auxiliary power. A dark LED tells you the fault is on the truck side, not the trailer.
When the trailer cord itself is cut or corroded, the 7-way inline cord replaces it: an 8 foot lead with a molded plug at one end and a junction box at the other. The box has seven color-marked posts and rubber grommets, five open and four closed, so you seal the holes you do not use. Read the plug diagram before you connect a single wire. The 10 gauge SAE harness is a different job: five 12 inch two-wire leads with polarized plugs for a solar panel, an inverter or a car amplifier. All four belong to the RV and trailer parts of the Miady lineup.
Shop by what it powers
More from Miady
Questions
Miady trailer wiring adapters and testers: your questions
Can you tow a 4-flat trailer from your 7-way truck socket with a Miady adapter?
Yes. The 7-blade to 4-flat adapter plugs into the round 7-way socket and gives the trailer a 4-way flat connection, with no splicing.
What does the Miady 7-pin tester show you?
Six LEDs, one each for tail lights, brake lights, reverse lights, left and right turn signals and auxiliary power. A light that stays dark points to that circuit on the vehicle.
How much reach do you get from the Miady 7-way inline cord?
Eight feet, with a molded 7-way plug on one end and the junction box on the other.
What can you connect with Miady SAE quick disconnect leads?
Two-wire gear such as a solar panel, an inverter or a car amplifier. The leads are 10 gauge, 12 inches long, red and black, five to a pack.
Ready when you are
Power for the pocket and the pedestal
Power banks from 5,000 to 20,000mAh, cords and plugs from 15 to 50 amps, and batteries from 6 to 12 volts make up the Miady lineup.
Every power bank, cord, plug and battery of the Miady range in one place.