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Complete kit bundle containing all necessary components for your project. Professional-grade components designed for reliable performance and long-lasting durability.
ZCI sensor technology and direct connection to the tow vehicle battery, eliminates all electrical connection and interference with the tow vehicle electrical system. Vehicles with 12 volt system only.
| BRAND: | TEKONSHA |
| PART NUMBER: | 119251 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1.9 LBS |
| UNIVERSAL OR SPECIFIC FIT: | UNIVERSAL |
| TERMINAL QUANTITY: | 4 |
| WIRING HARNESS INCLUDED: | YES |
| CONVERTER TYPE: | Powered |
| CONNECTOR SHAPE: | BOXED |
| ILLUMINATED: | NO |
Keywords: TK119251-5PK bundle kit, complete kit, professional components, industrial kit, TK119251, Tekonsha
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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The ZCI ModuLite is a trailer lighting control module that converts your vehicle's lighting signals to trailer-compatible outputs via a 4-flat connector. It reads your vehicle's turn, brake, and tail light functions and outputs them to power a trailer. The module requires constant 12V power and uses input sensors clamped around your vehicle's light wires to detect when lights are activated.
The ZCI ModuLite works with four vehicle wiring systems: Type A (2-wire: turn/brake combined, tail separate), Type B (3-wire: turn, brake, and tail on separate wires), Type BT (Brake/Tail multiplexed, turn separate), and Type BTT (Brake/Tail/Turn all combined on one wire). The module may not work with some BTT wiring systems; if it does not, you may need to route the tail wire to the rear license plate illumination circuit and/or brake to the center high stop light.
Yes. The wiring kit is sold separately. Wire kit 118150 or 118151 is required and is not included in the 119250 module package. The kit includes the power wire, ring terminal, fuse holder, butt connectors, and other electrical components needed for installation.
Required tools are: Phillips Head #2 Screwdriver, Wire Cutters, Tester or Volt Meter, Wire Strippers/Wire Crimpers, Socket & Ratchet Set, and a Drill with 3/32" Drill Bit. These tools are needed for sensor installation, wiring connections, grounding, and module mounting.
The 119250 module includes: 20 cable ties (8.5"), 1 cable tie (14.5"), 4 foam tape pieces, 1 15 AMP fuse, 1 self-tapping screw, 1 double-sided tape, 1 reference card, and 1 notice label. The following items are not included but sold separately in wire kit 118150 or 118151: 1 power wire, 1 ring terminal, 1 fuse holder, and 2 yellow butt connectors.
Yes. You must disconnect and isolate the vehicle's negative battery terminal before routing the power wire to the battery's positive side. After connecting the power wire using the fuse holder, butt connector, and ring terminal, you reconnect the negative battery cable. Do not insert the 15 AMP fuse until you are ready to enter learn mode.
First, determine your vehicle's wiring system type (A, B, BT, or BTT) by checking the vehicle's electrical system and locating the turn, brake, and tail light wires. Then refer to the Vehicle Wiring Code & Description table in the manual. Each wiring type specifies which vehicle wires to connect to the yellow (left turn), green (right turn), brown (tail), and red (brake) input sensors. Use only the sensors specified for your wiring type; unused sensors are not connected.
1. Clamp the appropriate input sensor (yellow, green, brown, or red) around the corresponding vehicle light wire. 2. Ensure the arrow on the sensor lid points toward the vehicle's light (or away from the light if your vehicle is a G-code low-side-switched system). 3. Lay the wire between the sensor's ferrites and snap the lid closed. 4. Secure the sensor end with foam tape to prevent movement during operation. Repeat for each required sensor based on your vehicle's wiring type.
Mount the module in a suitable location inside the vehicle, such as under the dashboard or behind a panel. Use the double-sided tape provided to secure it. The module must be mounted so that the epoxy side points toward the ground to prevent water buildup. Choose a location that allows easy access to the module for future reference card storage or reset if needed.
Locate a suitable grounding point near the module, such as an existing ground stud on the vehicle chassis. If no suitable point exists, drill a 3/32" hole in the vehicle frame (not the floor or bed) and secure the white ground wire using the eyelet and self-tapping screw provided. Clean dirt and rustproofing from the area before connecting to ensure good metal-to-metal contact.
Drilling may be required. You must drill a 3/32" hole to ground the white wire if no suitable existing ground stud is available near the module. Before drilling, verify what is behind the surface to avoid damage to the vehicle or personal injury. Do not drill into the vehicle floor or bed, and do not drill into any exposed surfaces. If an existing ground stud is available, drilling is not necessary.
Route the power wire from the module to the vehicle's positive battery terminal. Using the fuse holder, butt connector, and ring terminal (all included in the separate wire kit), connect the power wire to the positive post of the battery. Do not insert the 15 AMP fuse at this time. The module must be connected to a constant power source that does not shut off when the vehicle is off. Route the wire carefully to avoid hot pipes, heat shields, the fuel tank, or any points that may pinch or break the wire.
Use the cable ties provided (8.5" and 14.5" sizes) to secure the harness along its route from the module to the battery. This prevents damage to the wires and eliminates rattling during vehicle operation. Wrap the notice label around the yellow fuse holder wire near the ring terminal to identify the power connection.
Do not exceed the lower of the towing manufacturer's rating or: Maximum stop/turn light: 2 per side (4.2 amps); Maximum tail lights: 7.5 amps. Overloading the circuit can cause fires. Consult your vehicle's owner's manual and instruction sheet for additional information on your specific towing capacity.
The ZCI ModuLite uses a 15 AMP fuse. A 15 AMP fuse is included with the module. Do not insert the fuse until you are ready to enter learn mode after all wiring connections are complete. The fuse holder is connected to the positive battery terminal and protects the power circuit.
Learn mode is the initialization process that teaches the ZCI ModuLite to recognize your vehicle's lighting signals. To activate learn mode: 1. Start the vehicle and turn off all functions (tail lights, brake, and turns). 2. Insert the 15 AMP fuse into the fuse holder. 3. Activate each function separately for approximately 5 seconds: tail lights, brake, right turn, and left turn. 4. Test and verify the installation with a test light or trailer. 5. Hand the ZCI Reference Card to the vehicle owner or place it in the glove box.
After completing learn mode, test and verify the installation using a test light or by connecting an actual trailer. Activate each lighting function (tail, brake, right turn, left turn) and confirm that the 4-flat connector outputs the correct signals. If the module does not output power to the 4-flat connector or outputs are not functioning properly, refer to the troubleshooting guide in the manual.
Wear safety glasses during installation. Read and follow all vehicle warnings and installation instructions before beginning. When using a volt meter or circuit tester, carefully probe one wire at a time—do not probe across two wires or across vehicle structure. Verify what is behind any surface before drilling to avoid damage to the vehicle or personal injury. Do not drill into the vehicle floor, bed, or exposed surfaces. Read and follow all warnings printed on the tow vehicle's battery before connecting the power wire.
The ZCI ModuLite requires constant 12V power to maintain its learned settings. If the power is interrupted when the vehicle is off, the module may need to be reset by removing the 15 AMP fuse and repeating the learn mode and verification steps. Do not use an alternative power source that shuts off when the vehicle is turned off.
Route the power wire carefully to avoid hot pipes, heat shields, the fuel tank, or any other points that may pinch or break the wire. Secure the wire with the cable ties provided to prevent movement and damage during vehicle operation. Do not allow the wire to come into contact with moving parts or sharp edges.
Hand the ZCI Reference Card to the vehicle owner or place it in the glove box. The reference card contains important information about the module and may be needed for future troubleshooting or if the module requires a reset. The manual also references that additional information is available at http://www.tekonsha.com/support/installation/N119250.pdf.
The ZCI ModuLite works with vehicles that have 2-wire, 3-wire, BT (Brake/Tail multiplexed), or BTT (Brake/Tail/Turn multiplexed) wiring systems. It may not work with some BTT systems. Determine your vehicle's wiring type by checking the electrical system and light wire configuration, then refer to the Vehicle Wiring Code table in the manual.
Wire kit 118150 or 118151 is required and sold separately. It includes the power wire, ring terminal, fuse holder, and butt connectors needed for battery connection.
The ZCI ModuLite uses a 15 AMP fuse. A 15 AMP fuse is included. Do not insert the fuse until you are ready to activate learn mode after all wiring is complete.
Do not exceed: Maximum stop/turn light 2 per side (4.2 amps); Maximum tail lights (7.5 amps). Overloading can cause fires. Consult your vehicle's owner's manual for your towing capacity.
Yes. Disconnect and isolate the vehicle's negative battery terminal before routing the power wire to the positive terminal. Reconnect the negative cable after all connections are made but before inserting the 15 AMP fuse.
Wear safety glasses during installation. When testing with a volt meter, probe one wire at a time—do not probe across two wires or vehicle structure. Before drilling, verify what is behind the surface to avoid damage or injury.
Check the following in order: 1. Ensure the 15 AMP fuse is fully inserted into the fuse holder with no breaks. 2. Verify the fuse holder is correctly connected to the positive post of the battery. 3. Check the chassis ground: ensure the ring terminal is in full contact with bare metal of the vehicle's chassis. 4. If the ground is poor, clean the area and reattach. After each check, remove the 15 AMP fuse and repeat the learn mode and verification steps.
1. Verify that the input sensors are installed correctly according to your vehicle's wiring type (A, B, BT, or BTT). 2. Ensure each sensor end is oriented correctly: the arrow on the lid should point toward the vehicle's light (or away from the light for G-code vehicles). 3. Verify that sensor ends are installed and secured with foam tape. 4. After each correction, remove the 15 AMP fuse and repeat the learn mode and verification steps.
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