Towbar Wiring Essentials Training Manual
This manual has eight modules, covering key topics relating to Towbar electrics. Each module except 3 and 4 has a guidance section and a review section.
• Each Guidance section contains information and best practice.
• Each Review section is a form of self-evaluation chart and is to be used by the trainee during their everyday work, to judge their own performance against the standards indicated. The principle of the reviews is to harness the natural enthusiasm most people have to measure their own work against the highest standard
Road Lights
Initial Checks
The questions in this section point you at the checks you should do:
Check the operation of all lights and other functions on your check lists
Check that no warning lights are on to begin with (i.e. that there are no existing faults before you start.)
Take individual rear bulbs out, switch on and look for bulb-failure warning - (perhaps not the preferred option if multiplexed)
Look at high level lights, etc. and see if they are original equipment.
Look in the handbook to see if multiplex systems are mentioned.
Tell-tale signs are not obvious but some multiplex junction boxes have few (e.g. three) wires going in, including at least one thick one, and many coming out to feed the lamps. (Volvo Merc’s, Citroen have many cables running in all directions. On the other hand, Honda Fog Lamps show no unusual signs.)
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