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Tekonsha
Verify Fitment
Select your vehicle to confirm this part fits.
2000 - 2002 Chevrolet Express 1500
Confirmed to Fit
2000 - 2002 Chevrolet Express 2500
Confirmed to Fit
2000 - 2002 Chevrolet Express 3500
Confirmed to Fit
2000 - 2002 GMC Savana 1500
Confirmed to Fit
2000 - 2002 GMC Savana 2500
Confirmed to Fit
2000 - 2002 GMC Savana 3500
Confirmed to Fit

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Tekonsha T-One connector (also referred to as T-Connector) wiring harnesses are the fastest and easiest way to add an electrical connector to the back of your vehicle. These connectors are used to link the wiring from your vehicle to the trailer when towing. Tekonsha T-One connectors feature custom designs to fit each vehicle make and model based on manufacturer specifications. Plus, the Plug & Play connectors on the end of the wires make it easy to install. No cutting or splicing!
Tekonsha offers the largest, most complete line of T-One connectors. To install a Tekonsha T-One wiring harness, simply locate your vehicle's wiring harness connector typically behind the vehicle taillight - unplug the connection and insert the T-Connector into the vehicle's harness. It's that easy! So what are you waiting for? Hit the road with the peace of mind only Tekonsha can provide. Life's a Journey. Stop Often.
| BRAND: | TEKONSHA |
| PART NUMBER: | 118377 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1 LBS |
| UNIVERSAL OR SPECIFIC FIT: | SPECIFIC |
| CIRCUIT PROTECTED: | YES |
| HARNESS TYPE: | MALE FEMALE |
| TERMINAL QUANTITY: | 4 |
| WIRE COLORS: | BROWN, GREEN, YELLOW, WHITE |
| WIRE QUANTITY: | 4 |
| WIRE GAUGE: | 16 GA. |
| POWER LEAD REQUIRED: | NO |
| ELECTRICAL SYSTEM TYPE: | 3-WIRE SYSTEM |
| HARDWARE INCLUDED: | YES |

Tekonsha is a leading manufacturer of electronic trailer brake controllers, pioneering the category in the 1970s. The lineup spans proportional units such as the Prodigy P3 and Prodigy iD, time-delayed controllers, the wireless Prodigy RF, plus vehicle-specific wiring harnesses, adapters and trailer brake components engineered for smooth, predictable stopping at any speed.
Tekonsha Engineering Company began in 1964 building RV steps and mirrors. Within a few years it had found its real calling, and by the 1970s Tekonsha was pioneering the manufacture of electronic trailer brake controllers, the product category that still defines the brand. More than half a century later it remains the reference name in trailer braking and is part of the Horizon Global group alongside Reese, Draw-Tite, Fulton, Bulldog and Wesbar.
A brake controller is the component that tells a trailer's electric brakes how hard to work and when, and getting that right is the difference between a controlled stop and a shove from behind. Tekonsha builds both major types. Proportional controllers use an internal accelerometer to sense how quickly the tow vehicle is slowing and apply trailer braking to match, so light braking stays light and hard braking is immediate. Time-delayed controllers ramp to a preset output over a fixed interval, a simpler and more economical approach that suits occasional towing.
The current brake controller range covers most of that ground. The Prodigy iD pairs with a phone through Tekonsha's EDGE technology for setup and monitoring, the P3 offers storable settings for multiple trailers and a trilingual colour LED display, the Prodigy P2 adds a dimmable display and boost mode for heavier loads, and the Voyager keeps operation simple and dependable. The Prodigy RF mounts to the trailer itself and controls wirelessly, which suits rental fleets and drivers who swap tow vehicles.
Installation is supported by vehicle-specific brake control harnesses that plug into a factory connector rather than requiring cut-and-splice wiring, along with mounting brackets and adapters. Matched controller bundles pair a unit with the correct harness. Products are tested to meet and often exceed published industry standards.
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6 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2000 - 2002 | Chevrolet Express 1500 | Tow Harness T: Connector Assembly Uses all existing holes. No Drilling required Install Time is 10 minutes |
| 2000 - 2002 | Chevrolet Express 2500 | Tow Harness T: Connector Assembly Uses all existing holes. No Drilling required Install Time is 10 minutes |
| 2000 - 2002 | Chevrolet Express 3500 | Tow Harness T: Connector Assembly Uses all existing holes. No Drilling required Install Time is 10 minutes |
| 2000 - 2002 | GMC Savana 1500 | Tow Harness T: Connector Assembly Uses all existing holes. No Drilling required Install Time is 10 minutes |
| 2000 - 2002 | GMC Savana 2500 | Tow Harness T: Connector Assembly Uses all existing holes. No Drilling required Install Time is 10 minutes |
| 2000 - 2002 | GMC Savana 3500 | Tow Harness T: Connector Assembly Uses all existing holes. No Drilling required Install Time is 10 minutes |
The Tekonsha T-One T-Connector Harness, 4-Way Flat, w/Converter TK118377 (Part #TK118377) fits the following vehicles: 2000-2002 Chevrolet Express 1500; 2000-2002 Chevrolet Express 2500; 2000-2002 Chevrolet Express 3500; 2000-2002 GMC Savana 1500; 2000-2002 GMC Savana 2500; 2000-2002 GMC Savana 3500. Always verify your specific year, make, and model before ordering.
Yes, the Tekonsha T-One T-Connector Harness, 4-Way Flat, w/Converter TK118377 (Part #TK118377) is designed to fit the 2000-2002 Chevrolet Express 1500.
The Tekonsha T-One T-Connector Harness, 4-Way Flat, w/Converter TK118377 (Part #TK118377) fits 2000-2002 Chevrolet Express 1500 models. The 2002 model year is the last year covered by this part number. For newer models, check for an updated version.
The Tekonsha T-One T-Connector Harness, 4-Way Flat, w/Converter TK118377 (Part #TK118377) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The 18377-037 is rated for 7.5 amps per circuit. It is designed to connect a trailer or auxiliary lighting system to a vehicle's existing taillight wiring harness without cutting or splicing factory wires.
The manual does not specify which vehicle makes, models, years or body styles are compatible with the 18377-037. Contact the manufacturer or your dealer to confirm fitment for your specific vehicle before purchasing.
The manual does not specify whether battery disconnection is required. Consult your vehicle's service manual or a qualified installer to determine if this step is necessary for your vehicle.
The manual indicates you will need either a screw or cable tie (both provided with the unit) to secure the black box. No other tools are mentioned in the installation instructions.
The black box is positioned on the driver's side of the vehicle, behind the rear interior trim panel. It is secured with either a screw or cable tie (provided) after the wiring connections are made.
The yellow wire connector is plugged into the left (driver's side) vehicle taillight wiring harness connector. The green wire connector is plugged into the right (passenger's side) vehicle taillight wiring harness connector. The manual does not specify the function of each wire beyond their left/right positioning.
1. Remove the rear interior trim panels near the doors and locate the vehicle's taillight wiring harness connectors on each side. 2. Disconnect the vehicle wiring harness connectors on the driver's side, being careful not to damage the locking tabs. 3. Plug the T-Connector harness connector containing the yellow wire into the left vehicle wiring harness connector, ensuring connectors are fully inserted using existing and supplied locking tabs. 4. Repeat for the passenger side using the connector containing the green wire. 5. Tuck the green wire under the floor trim (threshold) panel.
The 18377-037 includes the T-Connector adapter with yellow and green wire connectors, a black box, cable ties, and a screw for securing the black box to the vehicle. Locking tabs are supplied as part of the connector assembly.
On some early production vehicles, the taillight and stoplight circuits may be reversed. If this occurs, the wires can be switched as shown in the diagram provided with the unit, or contact your dealer for an earlier application with the correct wire position.
Secure the black box on the driver's side behind the rear trim panel using either the provided screw or one of the provided cable ties. The green wire should be tucked under the floor trim (threshold) panel before securing the box.
No. The 18377-037 T-Connector uses a plug-and-play design that connects to existing vehicle taillight wiring harness connectors without cutting, splicing, or permanently modifying factory wires.
Connectors must be pushed together completely until they seat fully, utilizing both the existing vehicle locking tabs and the supplied locking tabs on the T-Connector. This ensures a secure, reliable electrical connection.
The manual does not specify compatible vehicles. Contact the manufacturer or dealer to confirm fitment before purchasing.
Only a screw or cable tie (both provided) to secure the black box. No additional tools are required.
No. The T-Connector plugs directly into existing vehicle taillight harness connectors without cutting or splicing.
The unit is rated for 7.5 amps per circuit.
Early production vehicles may have reversed taillight and stoplight circuits. Switch the wires as shown in the diagram, or contact your dealer for a corrected application.



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May 22, 2023