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How to test the connection of a Trailer (can also be a caravan or bicycle carrier)
1. Put the plug in the connection of the tester.
2. Press the yellow button on the side of the tester.
3. If the wiring is good, all the LEDs light up. The function of each LED is (acc .Iso 1724):
4. If a LED doesn't light up, it is because the corresponding wire is defective.
If all the LEDs don't light up.
A
Left hand indicator (yellow)
B
Fog light or 12V (blue)
C
Right hand indicator (green)
D
Right rear light (brown)
E
Brake light, right & left (red)
F
Left rear light (black)
Ground (white)
Attention: The pin B at 7-pins connector can be used either for a warning rear fog lamp or a
permanent 12 V connection.
How to test the connection of a Car / Camper
1. Put the tester in the socket of the car.
2. Press the yellow button on the side of the tester:
3. If the wiring is good, all the LEDs light up. Do again steps 4 as previous.
You can also test the functions of each pin of the socket.
1. Switch on the left hand indicator (after switching on the ignition key).
2. The corresponding LED must flash with the same frequency. If not, the left hand indicator wiring is
defective / broken.
3. Repeat steps 1 and 2 for the right hand indicator, rear light, fog light and stoplights.
Note: With a 4 m extension cable, you can test the functions from the driver's seat more easily.
PROBLEMS AND POSSIBLE CAUSES
Problem
Some LEDs
1
do not light up
None of the
2
LEDs light up
One or more LEDs
3
are weak or twinkle
All the LEDs are
4
weak or twinkle.
The lights of the trailer
5
do not light up but the
LEDs do
If the vehicle is equipped with an electrical fog light interruption relay, this one has to be tested with a
21 Watt bulb.
BGS technic KG
Bandwirkerstr. 3
D-42929 Wermelskirchen
Trailer
Wire damaged or bulb defective.
Bad contact.
Mass wire damaged or all bulbs
defective. Check the battery of
the tester
Wire damaged or contacts dirty
in
Mass wire damaged. Check
battery of the tester
Short circuit in the trailer wiring.
The fuses will break.
Tel.: 02196 720480
Fax.: 02196 7204820
mail@bgs-technic.de
Car
(by pressing yellow button)
See left.
See left.
Wire damaged or the plug.
Contacts dirty in the socket.
See left.
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