I have got a Spanish Defender 110, 2003, Td5. All main lights, head lights and tail lights have suddenly failed. High beam works on flash only. Fuses are OK. I guess it is possibly a relay. Where is the relay for the lights in this vehicle? Haynes seems to suggest its behind the dash display, or maybe under the Bonnet. How do I recognise it when I know where it is? Does anyone have any other suggestions as to what the problem is? If it is a relay, why do they fail? old age? Or does something cause then to fail, wiring or something?