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2018 - 2020 Mercedes-Benz GLC350e
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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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1 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2018 - 2020 | Mercedes-Benz GLC350e | — |
The 2018-2020 Mercedes-Benz GLC350e SUV, Except PO3 Premium Package Tekonsha Custom 7-Way + Brake Controller Install Kit (Part #TBCW66980) fits 2018-2020 Mercedes-Benz GLC350e models. The 2020 model year is the last year covered by this part number. For newer models, check for an updated version.
Yes, the 2018-2020 Mercedes-Benz GLC350e SUV, Except PO3 Premium Package Tekonsha Custom 7-Way + Brake Controller Install Kit (Part #TBCW66980) is designed to fit the 2018-2020 Mercedes-Benz GLC350e.
The 2018-2020 Mercedes-Benz GLC350e SUV, Except PO3 Premium Package Tekonsha Custom 7-Way + Brake Controller Install Kit (Part #TBCW66980) fits the following vehicles: 2018-2020 Mercedes-Benz GLC350e. Always verify your specific year, make, and model before ordering.
The 2018-2020 Mercedes-Benz GLC350e SUV, Except PO3 Premium Package Tekonsha Custom 7-Way + Brake Controller Install Kit (Part #TBCW66980) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The BRAKE mate is a trailer brake control system that allows you to control trailer brakes from your vehicle. It connects to your vehicle's electrical system and includes a brake control unit that mounts under the dash, circuit breakers for power management, and a prewired connector that attaches to your trailer.
The manual does not specify which vehicle makes, models, or years are compatible with the BRAKE mate. Contact Cequent Towing Products technical service at (888) 521-0510 or consult a fitment database to confirm compatibility with your specific vehicle.
Yes. Step 4 of the installation instructions requires connecting the 4-pole flat connector to the vehicle's connector, which means your vehicle must already have a 4-pole flat connector. If your vehicle does not have one, the BRAKE mate cannot be installed using these instructions.
The kit includes: 1 prewired connector, 1 heavy duty flasher, 1 20 amp circuit breaker, 1 40 amp circuit breaker, 5 #10 G-ring connectors, 2 3/8" G-ring connectors, 5 Scotch locks, 8 self-tapping screws, and 6 wire tie straps.
The manual does not specify required tools. However, based on the installation steps, you will likely need a drill (to create a firewall hole if one does not exist), wire strippers, a screwdriver (for self-tapping screws), and possibly a crimper or pliers for ring connectors. Contact technical service at (888) 521-0510 for a complete tool list.
The manual does not specify whether the battery must be disconnected before installation. Contact Cequent Towing Products technical service at (888) 521-0510 for safety guidance before beginning work.
Mount the bracket for the round connector on the bumper if that is where you intend to install it. Some hitches have built-in brackets, so check your hitch first before mounting a separate bracket.
Mount the brake control unit under the dash onto something firm. The unit must be securely fastened to a solid surface.
Mount the 2 circuit breakers (20 amp and 40 amp) end to end on the firewall within reach of the BLUE/BLACK cable. Secure them with the self-tapping screws supplied in the kit.
You may need to drill a hole through the firewall to run the BLUE/BLACK 2-strand wire from the engine bay into the cab. Look for an existing spot first; if none is available, drill a hole and seal it with a rubber grommet or silicone to prevent water and debris from entering the cab.
Some hitch brackets may need to be cut to allow the various connectors to pass through. Check your specific hitch bracket during installation; if it blocks connector passage, you will need to cut it.
Yes. In step 9, you must cut the black wire to create two open ends. These ends are then fitted with ring connectors and attached to the 40 amp and 20 amp circuit breakers respectively.
WHITE = ground wire; BLUE/BLACK = 2-strand power and trailer brake wire (runs from rear connector to front of vehicle and through firewall); RED = power wire from brake control unit; BLUE = trailer brake wire from brake control unit; GREEN = wire from brake control unit to brake switch.
Connect the WHITE ground wire to the frame of the vehicle. This provides the ground connection for the system.
Run the BLUE/BLACK 2-strand wire along the frame rail to the front of the vehicle, avoiding the exhaust, axles, and brake cables. Secure it with the plastic tie straps supplied. Then run it up the firewall, avoiding the steering mechanism, and secure it with ties.
Split the BLUE/BLACK 2-strand wire down the middle. Connect the RED (power) wire of the brake control unit to the BLACK wire using a Scotch lock. Connect the BLUE (trailer brake) wire of the brake control unit to the BLUE wire using a Scotch lock. Connect the WHITE wire of the brake control unit to the ground on the vehicle body. Connect the GREEN wire of the brake control unit to the inactive side of the brake switch.
Run a heavy gauge wire from the battery or equivalent power source to the battery side of either circuit breaker. Attach a #10 G-ring connector to one end of the wire. Then split a wire off this main wire to the 20 amp breaker using a Scotch lock and attach a #10 G-ring connector to the end of this wire. Alternatively, you can run a jumper between the two breakers.
The circuit breakers protect the electrical system. The 40 amp breaker is connected to the auxiliary side of the wire going to the rear connector. The 20 amp breaker is connected to the auxiliary side of the wire going through the firewall to the brake control unit.
The heavy duty flasher is a replacement turn signal flasher. If your turn signals blink too fast after installation, replace your vehicle's original turn signal flasher with the one supplied in the kit.
After attaching the round connector with self-tapping screws, test the connector for: running lights, brake lights, turn signals, and hot wire (power). Note that the brake control output cannot be tested unless a trailer is connected to the connector.
If the turn signals are blinking too fast after installation, replace the turn signal flasher with the heavy duty flasher supplied in the BRAKE mate kit.
After drilling a hole through the firewall to run the BLUE/BLACK wire into the cab, seal the hole with a rubber grommet or silicone to prevent water and debris from entering the vehicle.
When running the BLUE/BLACK 2-strand wire along the frame rail and up the firewall, avoid the exhaust, axles, brake cables, and steering mechanism. These components can damage the wire or be damaged by it. Secure the wire with the supplied plastic tie straps.
Your vehicle must have a 4-pole flat connector. Contact Cequent Towing Products at (888) 521-0510 or check a fitment database to confirm compatibility with your specific make, model, and year.
The kit includes a prewired connector, brake control unit, 20 amp and 40 amp circuit breakers, 5 #10 G-ring connectors, 2 3/8" G-ring connectors, 5 Scotch locks, 8 self-tapping screws, 6 wire tie straps, and a heavy duty flasher.
You may need to drill a hole through the firewall to run the brake wire into the cab if an existing hole is not available. The hole must be sealed with a rubber grommet or silicone.
Connect WHITE (ground) to frame, RED (power) to BLACK wire, BLUE (trailer brake) to BLUE wire, GREEN to brake switch, and run BLUE/BLACK from rear connector through firewall to brake control unit.
Test for running lights, brake lights, turn signals, and hot wire (power). Brake control output cannot be tested without a trailer connected. If turn signals blink too fast, replace the flasher with the one supplied.
Avoid routing the BLUE/BLACK wire near the exhaust, axles, brake cables, or steering mechanism. Secure all wires with the supplied plastic tie straps.
Yes, the T-One® Connector (118747-037) is designed for the Mercedes GLC300. The installation uses the vehicle's factory taillight wiring connectors on both driver and passenger sides, with the T-connector ends inserted between the vehicle's existing connectors.
The T-One® Connector is a trailer wiring interface that taps into the vehicle's taillight wiring system. It provides a connection point for trailer lights by inserting connector ends between the vehicle's factory taillight connectors on both the driver and passenger sides, allowing you to connect a trailer without modifying the vehicle's original wiring.
Required tools are: 10 mm socket and ratchet or 10 mm wrench, drill with 3/32" drill bit, wire crimpers, wire cutters, and Phillips head screwdriver. Safety glasses must be worn during installation.
The kit includes: T-One® Connector black box, green and yellow wire harness ends, white ground wire with eyelet and screw, black 12 ga. power wire, yellow fuse holder with 15 amp fuse, yellow butt connector, double-sided tape, and cable ties. The 4-flat connector should be stored in the rear cargo area when not in use.
Yes. You must disconnect the vehicle's negative (−) battery cable before connecting the power wire to the positive (+) battery terminal. This is done in step 10, after routing the black 12 ga. power wire to the engine compartment. Reconnect the negative cable in step 12 after the fuse is installed.
You must temporarily remove the rear threshold plate and access panels on both the driver and passenger sides to reach the taillight wiring connectors. These items are reinstalled at the end of installation in step 13. The manual does not indicate that any other permanent modifications or removals are required.
Drilling may be required for the ground connection. Step 8 states you should locate an existing ground stud near the connector, but if one is not available, you must drill a 3/32" hole to secure the white ground wire using the provided eyelet and screw. Do not drill into the vehicle floor or bed. You must verify what is behind any surface before drilling to avoid damage to the vehicle or personal injury.
The T-One® Connector uses three main wires: green wire (passenger side taillight connector), yellow wire (driver side taillight connector), and white wire (ground connection). The black 12 ga. power wire is routed from the connector box to the vehicle's positive battery terminal through a 15 amp fuse holder. The yellow butt connector joins the fuse holder to the black power wire.
The black 12 ga. power wire is routed from the connector box on the passenger side along the exterior frame or following existing wiring along the thresholds into the engine compartment up to the battery. Avoid areas that may pinch or break the wire. If routing through a grommet and along the vehicle exterior, carefully avoid hot pipes, heat shields, the fuel tank, and other pinch points. The wire connects to the vehicle's positive battery terminal through a 15 amp fuse holder.
A 15 amp fuse is used. The fuse holder is provided with the kit. In step 10, after disconnecting the negative battery cable, you attach the ring terminal to the vehicle's positive battery terminal and connect the other end of the fuse holder to the black 12 ga. power wire using the yellow butt connector. The 15 amp fuse is installed in step 12 after reconnecting the negative battery cable.
Begin on the passenger side: route the harness with the green wire through the side panel opening near the threshold, up behind the tail light pocket, then insert the T-One® Connector end with the green wire between the vehicle's taillight connectors and lock into place. Then on the driver side: locate the access hole between the spare tire and rear threshold, route the connector end with the yellow wire up through the hole to the access panel, then insert it between the vehicle's taillight connectors and lock into place. Ensure locking tabs are fully engaged and not damaged.
The black box is mounted on the passenger side using the double-sided tape provided. The remainder of the harness is secured with cable ties to prevent damage or rattling, taking care to avoid areas that would cut or pinch the wire.
The white ground wire is secured using the eyelet and screw provided. Locate a suitable grounding point near the connector, such as an existing ground stud. If no existing stud is available, drill a 3/32" hole and secure the wire with the eyelet and screw. Do not drill into the vehicle floor or bed. Clean dirt and rustproofing from the area before securing.
Always wear safety glasses during installation. Before drilling, verify what is behind any surface to avoid damage to the vehicle or personal injury. Do not drill into vehicle floor, bed, or exposed surfaces. When routing the power wire, avoid hot pipes, heat shields, the fuel tank, and pinch points. Secure all wiring with cable ties to prevent damage or rattling. Read and follow all warnings and cautions printed on the tow vehicle's battery. Do not exceed the towing manufacturer rating or product amperage ratings, as overloading circuits can cause fires.
After installation is complete, test and verify the installation with a test light or trailer. For the initial test, reset the vehicle's electrical system by temporarily removing the key from the ignition. All connections must be complete for the T-One® Connector to function properly.
Store the 4-flat connector in the rear cargo area when not in use.
Do not exceed the lower of the towing manufacturer rating (including in your vehicle owner's manual) or the specific amperage ratings stated on the product. The manual specifies a 15 amp fuse, which indicates the circuit is rated for 15 amps maximum.
All connector surfaces should be clean and free of dirt before inserting the T-One® Connector ends between the vehicle's taillight connectors. This ensures proper electrical contact and secure locking.
Insert the T-One® Connector end between the vehicle's wiring connectors and lock into place by engaging the locking tabs. Be careful not to damage the locking tabs and ensure that connectors are fully inserted with locking tabs in place. This applies to both the green wire end on the passenger side and the yellow wire end on the driver side.
Yes, the T-One® Connector (118747-037) is designed for the Mercedes GLC300 and connects to the factory taillight connectors on both sides.
You need a 10 mm socket/ratchet or wrench, drill with 3/32" bit, wire crimpers, wire cutters, Phillips screwdriver, and safety glasses.
Yes, you must disconnect the negative battery cable before connecting the power wire to the positive terminal in step 10, and reconnect it after installing the 15 amp fuse in step 12.
A 15 amp fuse is used. It is installed in the yellow fuse holder provided and connects the black 12 ga. power wire to the vehicle's positive battery terminal.
Do not exceed the lower of the towing manufacturer rating in your vehicle owner's manual or the specific amperage ratings stated on the product. The 15 amp fuse indicates the circuit maximum.
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