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Further to stepens answer, I am pretty good working on cars but replacing a complete wiring loom is a mammoth task, I would never attempt it.
You would probably end up with more faults than with the loom aleady in the car.
It would take a fully equiped auto electrician a few days to change the loom, even then it might not get rid of your problem.
As Geordie says, a diagnostic check should find the problem quickly, could just be a loose conection.
Currently in davesss's garage:
2002 Laguna Sports Tourer 1.8 Dynamique Moondust VF1KGOB, Fiat Siecento Micheal Schumaker, Kawasaki KLE M/Cycle and a cheap Mountain Bike.