Test Instrument Instruction Manual
628281
USER INSTRUCTIONS FOR
TEST INSTRUMENT
OPERATING INSTRUCTIONS
Important! Read the user instructions carefully before use. Save them for future reference. (Translation of the original instructions).
SAFETY INSTRUCTIONS
Read the User Instructions carefully before use. Save these instructions for future reference.
DESCRIPTION
FUNCTION TESTER FOR 7-PIN TRAILER PLUG Test instrument for control measurement of 7-pin plug on trailer and 7-pin socket on towing vehicle. The product quickly indicates any faults in the electrical system on the trailer or towing vehicle. Follow the instructions below.
OPERATION
FUNCTION TEST OF TRAILER PLUG
- Connect the trailer plug to the product.
- Press the yellow button on the side of the product.
- If all the wires are intact all the status lights (see below) as per ISO 1724 will go on.
- If a status light does not go on this means the corresponding wire is faulty.
| DESIGNATION | FUNCTION | COLOUR |
| 54 | Brake light | Red |
| L | Left direction indicator | Yellow |
| 54g | Rear fog light or 12V | Blue |
| 58L | Left rear light | Black |
| 31 | Earth | White |
| R | Right direction indicator | Green |
| 58R | Right rear light | Brown |
NOTE: Terminal 54g can be used for rear fog light or for 12 V connection (i.e. direct lead from the battery).
FUNCTION TEST OF TOWING VEHICLE
- Conned the product to the socket for the trailer.
- Press the yellow button on the side of the product.
- If all the wires are intact all the status lights will go on. If all the status lights do not go on, see above.
FUNCTION TEST OF EACH SEPARATE TERMINAL
- Switch on the vehicle ignition and activate the left direction indicator.
- The corresponding status light should flash with the same frequency, otherwise, there is a fault on the wires for the left direction indicator.
- Repeat steps 1 and 2 to function test the right direction indicator, rear lights, fog lights, and brake lights. Use a 4 m extension cable to enable the check to be done from the driver seat.
TROUBLESHOOTING
| PROBLEM | TRAILER | TOWING VEHICLE |
| Some status lights do not go on. | Wire fault, broken bulb or loose contact. | Wire fault, broken bulb or loose contact. |
| No status lights go on. | General wiring fault. | General wiring fault. |
| All bulbs are broken. | All bulbs broken. | |
| Product battery discharged. | Product battery discharged. | |
| One or more status lights shine weakly or irregularly. | Loose contact. | Loose contact. |
| Contaminated terminals. | Contaminated terminals. | |
| All status lights shine weakly or irregularly. | General wiring fault. | General wiring fault. |
| Product battery discharged. | Product battery discharged. | |
| The trailer lights do not go on even though the product status lights go on. | Short circuit in electrical system on the trailer. The fuses will trip. |
NOTE: If the vehicle is fitted with a fog light relay this must be function tested with a 21W bulb.
Care for the environment! Recycle discarded products in accordance with local regulations.
Jula reserves the right to make changes. For the latest version of operating instructions, see www.jula.com
JULA AB, BOX 363, SE-532 24 SKARA
2021-12-23
© Jula AB
