On-Auto offers you a wider selection of electrical products than any other trailer supplier. Our vast range of electrical products covers everything you’ll need for either your trailer lighting system or for your vehicle tow-bar wiring systems.We can provide good, clear lighting for your trailer, which is essential for the safety of you and other road users. On-Auto has every possible lighting option covered. Complete rear light clusters, lighting boards, marker, side, fog and number plate lights and reflectors. We also sell a range of lenses to go with this.