I am about to buy a small trailer and already have a towbar which I intend to fit myself.
In the distant past, I wired trailer plugs by identifying the relevant wires and connecting with Scotch Locks. Now I find that there are bypass relays.
Since my car is not fitted with bulb-check technology, do I need a bypass relay?
Does the Control Technique include trailer wiring?
Am I required to report installation of a towbar for registration or insurance purposes?