The connector should come with a list specifying which pin handles which circuit. Follow it--but don't for a minute trust that someone else who wired your vehicle before you followed anything except his own whim.
Tag each wire with its function as you identify it. Now you can turn off the running lamps and activate the left turn signal. Identify which circuit is the blinker, and repeat for the right turn signal. Wire all to the connector. A few vehicles use separate lamps for the brake and the turn-signal functions of the rear lights. That's fine--until you realize the trailer uses a single 2-filament bulb for all three functions.
Adding another taillamp housing to the trailer is one option, but a simpler solution exists. Your trailer-rental place, and most auto parts stores, sell simple electronic adapters that will combine the brake-lamp and turn-signal functions. It installs in the harness just before the trailer connector. Some larger trailers have a separate circuit for clearance or marker lights, which are separate from the running lights in the taillamp assemblies.
You may need to add another circuit to handle them. If you try to wire them in parallel with the customary pair of running lamps, you may overload the vehicle's headlamp switch--so you'll need to add a relay to handle the extra current. There also may be a volt circuit for running lights inside the trailer or for charging the trailer battery in the case of a travel trailer.
This circuit probably will be hot whenever the engine is running, but it may be controlled by a switch on the dash. Be sure the wires are of a gauge large enough to handle the load a fully discharged deep-cycle trailer storage battery may draw 20 or more amps when you start the engine.
The use of a battery isolator is strongly recommended. This will prevent discharging the vehicle battery from the trailer, and prevent surges of current from overcooking the wiring or blowing a fuse. This leads to the concept of electric trailer brakes.
These are actuated by a controller in the vehicle that increases the voltage to the brakes proportional to the vehicle's deceleration. This requires a wire from the controller to the trailer brake. This is why some connectors have as many as seven pins, to make provisions for the multiple circuits. Use ga. If you have electric trailer brakes, there must be an auxiliary battery and a breakaway switch in the circuit to slow the trailer if it comes loose from the hitch.
How to make the connections? We've seen plenty of trailers lumbering down the road with blinking or dim lights. An electrical converter is often used for those vehicles that do not have a customized converter.
The purpose of the electrical converter is to improve the compatibility between your simple trailer wiring and the complex vehicle wiring. When making connections, you must distinguish between the use of plugs and sockets. When we refer to the socket, we are talking about the side of the vehicle where we make the connection, while the plug is the trailer side. For a boat trailer, we use a four-way cable system; for a boat, we use a five-way system; for a utility trailer, we use a four-way system; for a caravan trailer, we use a seven-way system; and for a trailer with five wheels, we use a seven-way cable system.
In these scenarios, it is very likely that your trailer has a different type of connector than your vehicle. You can bridge the gap by purchasing an adapter. Most adapters are plug-and-play adapters, but you may need to ground some wires. It gets complicated when you have trailers with more cables, and in this case, you need an adapter to make the connections.
The first step in wiring your trailer cables is to ground the white cable first. Feed the rest of the wires through the trailer frame. Disconnect the wires to prevent them from dangling. After you have attached the marker lights to the bolts provided, you can install the rear lights. If your lights do not work after installation, the problem may be due to the rear light bulbs.
A good repair manual will save you both time and money. Check out the best options here. Magnus is the owner and main author of MechanicBase. He has been working as a mechanic for over 10 years, and the majority of them specialized in advanced diagnostics and troubleshooting. Certified Automotive Diagnostic Technician.
Comments are closed. Post your question in our community instead. Contents show. Three-Wire System. Four-Wire System. Installing the 4-Pin Trailer Wires 4-pin trailer wiring diagram. Step 3 - Strip Insulation. Strip 1cm of insulation from all wires. Step 4 — Mount New Trailer Lights. Remove the two lights from the trailer light kit. Connect the wires from the lights to the new wiring. Before connecting each wire slide an appropriately sized piece of heat shrink over each wire.
Slide the heat shrink over the join and apply heat to seal. Repeat for second light. Connect the trailer plug to the socket on the tow vehicle and test the lights.
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