The 13-pin trailer cable from XPOtool has a length of 5 metres and has two 5-pin connectors in green and yellow. The wire cross-section of the cable is 5 mm². The connection cable can be used to connect trailers or caravans to the corresponding lights (not included).

The contact assignment of the seven poles is as follows:
No. 1: Direction indicator/indicator left
No. 2: Rear fog light
No. 3: Ground for poles 1-8
No. 4: Direction indicator/turn signal right
No. 5: Right tail light, clearance light: marker light, licence plate light
No. 6: Brake light
No. 7: Left-hand tail light, clearance light: marker light, licence plate light
No. 8: Reversing light
No. 9: General power supply
No. 10: Charging cable
No. 11: Ground for terminal 10 (from 2004)
No. 12: Free
No. 13: Ground for terminal 9 (from 2004).