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The ERICH JAEGER Trailer Testing Unit - Functional range
ERICH JAEGER is specialist for retrofitting wire harnesses for trailer operation. The company offers quick installation solutions and assistance with the activation.
After installation with all electrical connections to the vehicle electrical system and the trailer control unit, ERICH JAEGER recommends a final function check. After all, an error in the end consumers' vehicle display or the reclamation of a flashing brake light has to be prevented - because this is when the nerve-racking troubleshooting begins.
With the ERICH JAEGER trailer testing unit, specialist workshops can check the correct installation of a wire harness before handing over the vehicle to the customer and thus ensure all functions of the lighting system on the trailer.
Prerequisite for different systems
In practice, a 13-pin trailer socket according to ISO 11446 is usually retrofitted - this corresponds to the current state of the art and enables the connection of modern trailers. However, older 7-pin systems according to ISO 1724 are also used when it comes to the operation of simple load trailers.
The systems place different demands on a trailer tester: While only 6 different lighting functions are tested with a 7-pin electrical installation kit, the 13-pin system adds the function of the reversing light and two separate power supply circuits.
Both configurations can be tested quickly and easily with the compact ERICH JAEGER automotive testing unit.
| Contact no. | Function | Cross-sectional area | Core insulation color |
|---|---|---|---|
| 1 | Left-hand direction indicator light | 1,5 mm² | yellow |
| 2 | Rear fog light | 1,5 mm² | blue |
| 3 | Common return for contacts no. 1 to 8 | 2,5 mm² | white |
| 4 | Right-hand direction indicator light | 1,5 mm² | green |
| 5 | Right-hand rear, position and marker lights and license plate lamp | 1,5 mm² | brown |
| 6 | Brake lights | 1,5 mm² | red |
| 7 | Left-hand rear, position and marker lights and license plate lamp | 1,5 mm² | black |
| 8 | Reversing light | 1,5 mm² | pink |
| 9 | Power supply (steady, constant) | 2,5 mm² | orange |
| 10 | Power supply controlled by ignition switch | 2,5 mm² | grey |
| 11 | Common return for contact no. 10 | 2,5 mm² | white/black |
| 12 | Reserved for future allocation | --- | no core |
| 13 | Common return for contact no. 9 | 2,5 mm² | white/red |
| Contact no. | Function | Cross-sectional area | Core insulation color | Designation according to DIN 72552 |
|---|---|---|---|---|
| 1 | Left-hand direction indicator light | 1,5 mm² | yellow | L |
| 2 | Rear fog light | 1,5 mm² | blue | 54g |
| 3 | Common return | 2,5 mm² | white | 31 |
| 4 | Right-hand direction indicator light | 1,5 mm² | green | R |
| 5 | Right-hand rear, marker, position light and license plate lamp | 1,5 mm² | brown | 58R |
| 6 | Brake lights | 1,5 mm² | red | 54 |
| 7 | Left-hand rear, marker, position light and license plate lamp | 1,5 mm² | black | 58L |
Use and operation
Step 1 - Connecting the testing unit to the vehicle
- Remove the testing unit from the workshop shelf and establish the 13-pin connection to the vehicle via the 5m cable line
- Use enclosed adapter with the 7-pin socket on the vehicle
Step 2 - Checking the light functions and the charging line
- Switch on the desired light function in the vehicle
- On the tetsing unit, the corresponding light function marked with a symbol and the bulb of the trailer lighting illuminate
- When the continuous positive charging line is connected, the corresponding LED on the test case lights up
- When the switched charging line is connected, the corresponding LED lights up when the ignition is switched on
Step 3 - Checking the turn signal function
- Switch on left turn signal
Flip the "L" switch and check the corresponding error message for the legal requirement* of the trailer indicator check
Perform the same test for the right side
The operation of the trailer testing unit is therefore very simple. For better comprehensibility, ERICH JAEGER also provides an instruction video and operating instructions.
*Legal requirement
The function of the blinker lights on the trailer is the only function whose display must be monitored. In the event of failure of the trailer blinker light, this error must be indicated to the vehicle driver, for example by the double flashing frequency of the blinker control light in the cockpit.
FAQs - Use of the trailer testing unit
For whom is the product suitable?
The trailer testing unit is a must-have for all workshops that offer electric installation kits for retrofitting the trailer coupling. Furthermore, the purchase is recommended for small workshops that perform repairs on the trailer wiring or trailer socket.
What can the trailer testing unit do?
The ERICH JAEGER trailer testing unit quickly and reliably checks the correct functionality of the electrical wiring and trailer control electronics on the towing vehicle.
What can't the trailer testing unit do?
The trailer tester cannot correct the error itself. But it reliably displays any possible error and saves valuable time during troubleshooting.
How does the ERICH JAEGER solution differ from other competitive products?
The testing unit simulates the complete electrical system of a trailer. The loads with 21 watts and 10 watts correspond to the loads of a usual trailer lighting. ERICH JAEGER has deliberately dispensed with additional, unnecessary and expensive technology such as radio transmission: The robust solution with a 5m cable enables a simple function check, which can be carried out by only one person. In addition, it is immediately ready for use and easy to use.
In comparison, commercially available smaller test plugs for the trailer socket do not simulate the usual trailer loads and therefore do not offer the complete range of functions.
ERICH JAEGER thus has a robust, reliable and at the same time inexpensive service solution for small and large workshops in its range.
Technical data
Performance features
| Nominal voltage: | 12V |
| Contact: | 13-pin plug for 13-pin vehicle socket according to ISO 11446 |
| Adapter: | 13P/7P-adapter for 7-pin vehicle socket according to ISO 1724 |
| Cable length: | 5m |
| Outer size in cm: | 39/15/31 (L/H/W) |
| Weight: | 3,25 kg |
| Bulbs: | Light bulb 21 W (brake, indicator, reverse light, fog light) |
Scope of supply
- Automotive testing unit in robust, double-walled workshop test case
- Cable with 5 m length and 13-pin ERICH JAEGER plug
- Adapter from 13-pin to 7-pin plug
- Self-explanatory manual with pictograms in 25 languages
The ERICH JAEGER Testing Unit - Conclusion
With the testing unit for trailer simulation, ERICH JAEGER offers a robust, compact and inexpensive service tool for the technical inspection of the trailer interface. A must-have for all professional workshops offering retrofitting of a trailer coupling and for ambitious campers who want to play it safe.
