1. Réamhrá
This manual provides comprehensive instructions for the proper installation and operation of the Tekonsha T-One T-Connector Harness, Model 118599. This product is designed to provide a 4-way flat trailer wiring connection for specific Ford Explorer, Ford Taurus, and Lincoln MKS vehicle models, enabling trailer lighting functions without requiring modifications to the vehicle's existing wiring system.
2. Faisnéis Sábháilteachta
- Dícheangail ceallraí na feithicle i gcónaí sula dtosaíonn tú ar aon suiteáil leictreach chun turraing leictreach nó damáiste do chóras leictreach na feithicle a chosc.
- Cinntigh go bhfuil na naisc uile slán agus inslithe i gceart chun gearrchiorcaid a chosc.
- Route wiring away from hot exhaust components, sharp edges, and moving parts to prevent damage.
- Verify all trailer lights are functioning correctly after installation and before towing.
- Mura bhfuil tú cinnte faoi aon chéim den phróiseas suiteála, téigh i gcomhairle le teicneoir feithicleach cáilithe.
3. Ábhar Pacáiste
The Tekonsha T-One T-Connector Harness kit includes the following components:
- T-One T-Connector Harness with ModuLite HD module
- 4-Way Flat Connector with cap
- Power wire (16 gauge bonded wire)
- Sealbhóir fiús agus fiús
- Críochfort fáinne
- Nascóirí splice
- Scriú gléasta
- Ceangail cábla

Image 3.1: All components included in the Tekonsha T-One T-Connector Harness kit, featuring the main harness, ModuLite module, 4-way flat connector, power wire, fuse, and various installation accessories.
4. Socrú agus Suiteáil
The Tekonsha T-One T-Connector Harness is designed for a straightforward, do-it-yourself installation without requiring special tools or splicing into vehicle wires. Follow these steps carefully:
4.1. Ullmhúchán
- Uirlisí Bailigh: You will need basic hand tools such as a screwdriver, wire strippers/crimpers, and possibly a test light.
- Vehicle Access: Open the vehicle's trunk or tailgate and locate the access panels for the taillight assemblies. Remove these panels to expose the vehicle's wiring harness connectors.
- Ceallra a Dhícheangal: For safety, disconnect the negative terminal of the vehicle's battery.
4.2. Harness Connection
- Locate Vehicle Connectors: Identify the vehicle's taillight wiring harness connectors. These are typically located behind the taillight assemblies.
- Disconnect and Insert T-Connectors: Unplug the vehicle's wiring harness connector. Insert the corresponding T-One T-Connector into the vehicle's harness, ensuring a secure fit. The T-One connectors are designed to match the factory connectors, providing a 'factory' appearance.
- Repeat for Both Sides: Connect the T-One harness to both the driver's side and passenger's side taillight wiring.
4.3. ModuLite HD Module Mounting
- Modúl Gléasta: Find a secure, dry location within the vehicle's trunk or cargo area to mount the ModuLite HD module. Use the provided mounting screw or cable ties to secure it. Ensure the module is protected from moisture and physical damage.
- Ceangal Talún: Connect the white wire from the ModuLite module to a clean, unpainted metal surface on the vehicle chassis to establish a proper ground. Use the provided ring terminal and mounting screw.
4.4. Ceangal Cumhachta
- Route Power Wire: Route the black power wire from the ModuLite module to the vehicle's battery. Ensure the wire is routed safely, away from moving parts, exhaust, and sharp edges. Use cable ties to secure the wire along its path.
- Install Fuse Holder: Near the battery, cut the power wire and install the provided fuse holder. Insert the fuse into the holder.
- Ceangail le Ceallraí: Connect the power wire from the fuse holder to the positive (+) terminal of the vehicle's battery using a suitable connector (not always included, may require a separate purchase depending on battery terminal type).
4.5. Céimeanna Deiridh
- Secure 4-Way Flat Connector: Route the 4-way flat connector to an accessible location near the rear bumper, where it can be easily connected to a trailer. When not in use, store it in the cargo area or under the rear bumper, using the provided cap to protect the terminals.
- Ceallra athcheangail: Athcheangail críochfort diúltach ceallraí na feithicle.
- Córas Tástála: Before towing, perform a thorough test of all trailer lighting functions (turn signals, brake lights, running lights) with a connected trailer or a trailer light tester.
5. Treoracha Oibriúcháin
Once installed, operating the Tekonsha T-One T-Connector Harness is straightforward:
- Leantóir Ceangail: When ready to tow, remove the protective cap from the 4-way flat connector and plug it into the corresponding connector on your trailer.
- Fíoraigh Soilse: Always verify that all trailer lights (running lights, brake lights, left turn signal, right turn signal) are functioning correctly before driving.
- Disconnect Trailer: When not towing, disconnect the trailer's wiring harness from the vehicle's 4-way flat connector and replace the protective cap to prevent corrosion and damage.
6. Cothabháil
Minimal maintenance is required for the T-One T-Connector Harness:
- Iniúchadh Naisc: Periodically check all wiring connections for corrosion, fraying, or damage. Ensure the ground connection remains secure.
- Cosaint Nascóir: Always use the protective cap on the 4-way flat connector when not in use to shield it from dirt, moisture, and road debris.
- Teirminéil Glana: If terminals appear dirty or corroded, clean them with a wire brush and electrical contact cleaner.
7. Fabhtcheartú
If you experience issues with your trailer lighting, consider the following troubleshooting steps:
| Fadhb | Cúis Féideartha | Réiteach |
|---|---|---|
| No trailer lights | Blown fuse in fuse holder | Seiceáil agus cuir an fiús nua in ionad. |
| No trailer lights | Naisc scaoilte nó creimthe | Inspect all connections, clean if necessary, and ensure they are secure. |
| Specific trailer light not working | Faulty trailer bulb or wiring | Check the trailer's bulbs and wiring independently. |
| Soilse flickering | Ceangal talamh lag | Ensure the white ground wire is securely attached to a clean, unpainted metal surface. |
8. Sonraíochtaí
| Gné | Sonraíocht |
|---|---|
| Uimhir Mhúnla | 118599 |
| Cineál nascóirí | 4-Way Flat |
| Stop Light/Turn Signal Circuit Capacity | 2.1 Amps |
| Taillight Circuit Capacity | 5.6 Amps |
| Tomhsaire Sreang | 16 Gauge bonded wire |
| Cineál Modúl | Upgraded circuit protected ModuLite HD module |
| Ábhar | Copar |
| Meáchan Mír | 1.5 Punt |
| Toisí Táirge (L x W x H) | 3.98 x 3.88 x 8.88 orlach |
9. Barántas agus Tacaíocht
For warranty information and technical support, please refer to the official Tekonsha website or contact their customer service directly. Details regarding specific warranty periods and coverage are typically provided with the product packaging or on the manufacturer's official resources.