Rob L
Member
Do you know we're the terminal blocks would be ?? Deep in the dash I would expect !!!In that case it would seem to indicate that there is a high resistance wire / bad or corroded connection in the supply leading to the switch. Ideally you need to find that 30A fuse and check the voltage on it with the lights switched on & off to see if it is constant, if it is that would indicate the header as being a the most likely fault (they are basically just big terminal blocks). That wiring diagram is for a 1999 TD5 so would expect it to be the same or very close.