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This is a power module designed to control trailer lights based on signals from your vehicle's lighting circuits. Most vehicles have at least 4 separate circuits: Running (Tail) Lights, Brake, Left Turn, and Right Turn. Most basic trailers have a 4-wire connector with only 3 signals: Running (Tail) Lights, Left Turn, and Right Turn. The trailer does not have a separate circuit for Brake lights; applying the Brake is supposed to light up both the Left and Right Turn signals together.
This module combines the Brake and Left and Right Turn signals in an intelligent way, and also isolates the electrical load of the trailer lights from the vehicle's own lighting circuits.
After installing a towing hitch on my own vehicle, I needed to install wiring for the trailer lights. There are a couple usual approaches to doing this, neither of which really appealed to me:
Of course the logical thing to do was build it myself, to my own specifications. :)
This lighting controller uses XOR gates to intelligently combine the Brake and Turn signals. If the Brake is applied, both of the trailer's Left and Right Turn signals are lit; however, if the vehicle's Left Turn signal blinks on with the Brake applied, the trailer's Left Turn Signal goes out. (The Right Turn signal works the same way). Without the Brake applied, the vehicle's Turn Signals blink the trailer's Turn Signals normally. In this way, the "blinking" of a Turn Signal is always visible on the trailer, even when the brake is being applied. This also seems to be the method used by the "best" aftermarket trailer light converters.
See Datasheet link on right for a complete schematic.
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This device is intended for hobbyist, experimental, do-it-yourself use only. It has not been evaluated for vehicle safety or DOT requirements. BY PURCHASING THIS ITEM YOU AGREE TO ASSUME ALL RISK AND LIABILITY INVOLVING THE USE OF THIS DEVICE, AND AGREE TO HOLD HARMLESS AND INDEMNIFY THE SELLER AGAINST ALL RISKS, LIABILITIES, AND DAMAGES THAT MAY ARISE, INCLUDING, BUT NOT LIMITED TO, PROPERTY DAMAGE, LOSS OF LIFE OR PROPERTY, BOTH OF YOUR OWN OR OF ANY OTHER PARTY INVOLVED IN AN ACCIDENT INVOLVING YOUR VEHICLE. IT IS SOLELY YOUR RESPONSIBILITY TO VERIFY THE SAFE AND PROPER INSTALLATION AND FUNCTIONING OF THIS DEVICE, AS WELL AS MEETING ANY INSPECTION AND SAFETY REQUIREMENTS IN YOUR JURISDICTION. USE AT YOUR OWN RISK. THIS PRODUCT IS INTENDED FOR EXPERIMENTAL OFF-ROAD USE ONLY.
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I'm an avid electronics hobbyist and a talented programmer with a passion for creative problem-solving, design, and systems integration. As a member of the Creltek design group, I enjoy finding elegant solutions to complex problems, and combining hardware and software in new and unique ways. I maintain an extremely wide range of interests, and strive to stay on the cutting edge through constant innovation and application, both at work and during personal pursuit in my free time.
My current electronics research includes LED lighting, resonant high-frequency switching power supplies, embedded systems, multi-core microcontrollers, digital audio and MIDI, and the design of reusable circuit modules for rapid prototyping, research, and development.
My day job involves managing the IT department and teaching at a small private college. You can check out my LinkedIn profile here: https://www.linkedin.com/in/kevpatt
Creltek is a private technology design group engaged in innovative software and hardware integration, research, and development. We strive for high quality and excellence by design. When a member of our engineering team creates a module or tool that might be useful to others, we try to make it available here on Tindie!
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