I have a 2003 Sporting and have just fitted a towbar. When I came to do the wiring the instructions said that if there is bulb failure warning system you must consult the manufacturers technical data. I can find nothing on the fiat website. I have found loads of different bypass relays on offer on the web. What I need to know is what sort of wiring system does the car have and what type of relay do I need. Also does anybody have a wiring diagram for the rear lighting circuits.

Thanks in advance

Tom