General lighting questions, such as those relating to changing bulbs, diagnosing lighting faults, etc

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How should the lights for a trailer be hooked up?

I have a tent trailer and the lights don't work right. It has a 4 wire connector to my car but one of the wires on the trailer connector was worn out and probably not working. So I got a new 4 prong ...
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Requirements for number plate illumination (UK) (Are LED Bolts good enough for cars?)

Could someone tell me what the law states with regards to the illumination of number plates in the UK? (i.e. number of lights, intensity in mcd (milli-candella)?) I have installed a reversing camera ...