The issue of connecting the refrigerator to the on-board network of a DAF truck is critically important for drivers on long journeys. Autonomous power supply allows you to keep food fresh without the need to start the engine or use a diesel generator. However, incorrect connections can lead to battery discharge and problems starting the engine.
Modern DAF models such as the XF, CF and XG are equipped with a sophisticated power management system known as Bodybuilder Electrical System. Understanding how it works is necessary for the safe installation of additional equipment. In this article, we will look at where to look for connection points, how to control power through the menu, and what nuances exist for different generations of trucks.
Before proceeding with installation, it is important to determine the type of refrigerator you have. There are devices that operate from 12V (compressor or absorption), and those that require 220V. The latter will require an inverter, which significantly increases the load on the tractor’s electrical network. We will focus on standard and professional solutions for on-board network.
Searching for connection points in the DAF cab
The first step is the localization of the pins for connecting additional equipment. On DAF trucks these points are often located in a recess under the berth or behind trim panels at the rear of the cab. You will need to remove the mattress and locate the metal panel marked BEC or the fuse box.
It is important to distinguish between direct current and current that depends on the position of the ignition switch or (Key). A refrigerator usually requires constant voltage, but with deep discharge protection. The new DAF XF and XG models use a system Smart Keythat automatically turns off consumers after a specified time.
⚠️ Attention: Never connect powerful consumers directly to the battery terminals without installing an additional fuse in the open circuit. This could result in a wiring fire.
To locate loose leads, refer to the Wiring Diagram, which is often located in the glove compartment or available electronically through the dealership. Look for pins marked Battery+ or Permanent Power.
Setting power management through the DAF menu
Modern DAF trucks are equipped with intelligent battery monitoring systems. In order for the refrigerator to work correctly and not drain the battery, you need to set the shutdown thresholds in the on-board computer. These settings are accessed through the dashboard display.
Using the control buttons on the steering wheel or panel, go to the main menu. You need to find the section related to vehicle settings or electrical equipment. The interface may differ depending on the year of manufacture and installed software version DAF Connect.
- 🚛 Press the menu button on the dashboard.
- 🔧 Go to the section
Vehicle settings(Vehicle Settings). - ⚡ Find the subsection
Electrical systemorBattery Management. - 🔌 Activate the power option for external devices or set the shutdown timer.
Particular attention should be paid to the “Time to shutdown” parameter. The standard settings may be too short to operate the refrigerator at night. If the system allows, set the maximum value or the “Trucker” mode, if it is available in your configuration.
Connection diagrams and types of connectors
Connecting a refrigerator in a DAF requires the use of the correct connectors that meet the standard ISO or the specific requirements of the truck manufacturer. The most common option is to use a 7-pin or specialized connector DAF Multi.
When installing your own wiring, you must follow the color markings and cross-section of the wires. For refrigerators with a compressor consuming up to 10-15 Amperes, it is recommended to use a wire with a cross-section of at least 2.5 mm². Thinner wires may overheat.
| Connector type | Contact assignment | Maximum current | Location |
|---|---|---|---|
| ISO 7-pin | Constant +, Earth, Ignition | 15 A | Rear wall of the cabin |
| DAF Proprietary | Controlled +, CAN bus | 10 A | Under the sleeper place |
| Cigarette Lighter | Ignition (often) | 5-8 A | Instrument panel |
| Direct Battery | Constant +, Ground | Depends on the wire | Compartment Battery |
If you use a standard cigarette lighter socket, remember that it is often powered only when the ignition is on. To operate the refrigerator in a parking lot, you will need to resolder the contacts in the fuse box or install a relay.
Battery protection and smart relays
The main enemy of the driver in the parking lot is low battery. Standard DAF systems protect the battery well, but if non-standard equipment is installed, this protection can be bypassed. The use of a smart battery decoupling relay (Battery Isolator) is a must.
Such a device automatically turns off the refrigerator when the voltage on the main battery drops below a critical level (usually 11.8V - 12.0V). This will ensure that you can start the engine in the morning. In trucks with two batteries, the relay directs consumption to the second battery.
⚠️ Warning: Do not rely solely on the refrigerator's built-in protection. It may operate too late, leaving you with a deeply discharged starter battery.
Installing the relay requires minimal electrical knowledge. The device is mounted in the gap of the positive wire next to the power source. Some models have LED status indication, which is convenient for visual control.
What happens when the voltage drops below the threshold?
The smart relay opens the refrigerator's power circuit. The compressor stops. Power is restored only after the engine is started and the battery is charged to a level of approximately 12.8V.
Features of the DAF XF, CF and XG models
Different generations of DAF trucks have their own design features. In series models XF 105 connection points are often hidden behind plastic plugs in the cabin floor. In newer XF Euro 6 i XG architecture has become more complex due to the introduction of the system. DAF Connect.
Owners of new models should be careful with connecting "insert" into the standard wiring. This can lead to diagnostic errors and messages appearing on the instrument panel. It is recommended to use special adapters (plug-and-play), which do not require damaging the integrity of the factory harnesses.
CF models are characterized by the location of control units in a niche under the driver's seat. They may be difficult to access, so plan ahead for wiring. Use corrugated tubing to protect new wiring from chafing.
Diagnosing power problems
If the refrigerator does not turn on or operates intermittently, it is necessary to diagnose the circuit. First of all, check the fuse. In DAF they can be located not only in the main unit, but also in additional power distribution modules.
A common problem is poor contact at the junction of the wires. The vibrations to which the truck is exposed gradually weaken the strands and terminals. Use only crimp sleeves and heat shrink for connections.
- 🔍 Check the voltage at the refrigerator input (should be 12-14V).
- 🔌 Inspect the connectors for oxidation or melting.
- 🛡️ Make sure the protection relay did not go into "disabled" mode.
- 🔋 Measure the voltage at the battery terminals with the engine off.
If the refrigerator operates from the mains 220V via an inverter, check the inverter itself. Low input voltage may cause protective shutdown. Make sure that the cross-section of the wires from the battery to the inverter is sufficient for the transmitted power.
Why does the refrigerator turn itself off after an hour of operation?
Most likely, the DAF battery protection system is triggered. Check the timer settings in the car menu or install an external relay with a lower cut-off threshold. It could also be overheating of the compressor due to poor ventilation.
Can a refrigerator be connected to a 24V outlet?
Most car refrigerators are designed for 12V. Connecting to a 24V network (which is available in trucks) without a converter will cause the device to burn out. Make sure to take power from a 12V circuit or use a DC-DC converter.
Which fuse to choose for the refrigerator?
The fuse rating should exceed the maximum current consumption of the refrigerator by 20-30%. Typically, for compressor refrigerators, a 10A or 15A fuse is sufficient. The exact value is indicated in the device passport.
Does the operation of the refrigerator affect the DAF warranty?
If the connection is made through standard connectors or certified adapters without violating the insulation of the main harnesses, the warranty is maintained. Unauthorized insertion into the wiring may cause refusal of warranty repair of electronics.
What to do if there is no permanent plus?
If your configuration does not have a DC output, you will have to pull a separate wire directly from the battery through the interior, be sure to install a fuse at the battery itself. An alternative is to use buffer batteries (Power Bank for cars).