Also into the relay are 7 "switching" wires which connect to the vehicle's lighting circuits. When fitted it has a main 12 volt power supply into the 7-way unit, and 7 output wires leading to the towbar's electric socket. The 7-way bypass is a miniature bank of 7 of these electrically operated switches. When the power down the "finger" wire is removed, the relay switch is turned off. When power is sent down the wire, this "pushes" the switch, turning the relay on. Now visualise that switch but replacing your finger for an electrical wire. When your finger is removed, power is blocked through the switch (OFF). When your finger pushed the switch, power is allowed through the switch (ON). How the relay worksĪ relay sounds complex but essentially it is simply an electrically operated switch. ![]() The fitter need not have an in depth understanding of the "multiplexed" system - the smart bypass relay's inbuilt microchip does all that. The 7-way smart bypass relay does the job of translating these signals and is a simple in-line fit between the towbar wiring and the vehicle loom. What is needed is a way of "translating" the vehicle's pulsed shared signals into constant 12 volt supplies to each light on the trailer or caravan. This causes the fitter a problem in that the trailer or caravan lighting is traditional filament lighting with one wire per function and is not designed with these "multiplexed" systems in mind. These signals when examined with a simple circuit tester with a filament bulb appear to be constant signals, however they may be rapid pulses of electrical current, which are faster in frequency than the time a bulb takes to illuminate - and may be faster than discernable with the human eye, so the signal appears constant. The signal wires may also carry varying signals, for instance in the case of a single brake/tail light bulb, it's single signal wire can carry 2 signals - one instructing the bulb to light at low intensity, the other when the brakes are operated to light the bulb at high intensity. Essentially, these systems carry low-current and sometimes low voltage signals from the lighting controls down to the lights, which "tell" the vehicle lights what to do. It is easier to visualise using the term "multiplex". The term CAN-Bus refers to a Controlled Area Network which, to the DIY towbar fitter means absolutely nothing. So what are "multiplexed" and "CAN-Bus" systems? This guide does not set out to give such a complete understanding, rather to give a general idea of the nature of the systems - it should not be viewed as an electronics textbook, indeed the vaguaries of the guide may seem incorrect to the expert - however the expert is not who this guide is aimed at. In some ways the systems are complex, but it is not necessary to have a complete understanding of these systems in order to fit towing electrics. You may hear these systems referred to as "multiplexed" or "CAN-Bus" systems, which all sounds quite complicated. Many modern vehicles cut down on weight, size and volume of the wiring looms by using electronic control systems to operate the vehicle's lights. If you are unsure please contact our Customer Service and we will be happy to help you.For both people undertaking fitting a towbar for the first time, and those who have fitted a towbar previously and are considering fitting a towbar to a modern car, the prospect of wiring the towing electrics may seem daunting at first. We try to provide upto date information as possible. ![]() Secondly by checking to see if the Shape in the picture listed is the same as you have in your vehicle. Please make sure that is the correct Wiring Harness for your car by firstly checking to see if your make, model and year of car is listed in the description. If in doubt please email us with your vehicle details and we will confirm what you require. SOME KNOWLEDGE OF CAR AUDIO INSTALLATION IS HELPFUL IN CASE A MODIFICATION IN SOME RARE CASES MAY BE NECESSARY OR NEEDED.CAR AUDIO FITTING ACCESSORIES ARE SOLD WITH LIMITED INSTRUCTIONS.Harness AdaptorsĬonnect the head unit to the original radio connector without the need to cut any of the existing wiring. Simply plug one end of the adaptor into your cars wiring harness, and the other end into your new radio, without the need of tools or cutting of wires. It will convert the car original power and speakers wiring connector to a standard ISO connector. This adaptor is required to replace factory fitted radio with an aftermarket headunit (Alpine, Pioneer, Kenwood, Sony, JVC etc.). This lead is for the NON-AMPLIFIED systems on these vehicles only.
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