What people have to realise James is the original Ford wiring loom has been on the car for around 30 years or more and will be gradually breaking down. I had an intermittent electrical fault on my 1990 2wd Saff which despite checking every thing could not be traced. Got the new engine, fuel pump and cooling fans wiring loom fitted and the problem disappeared !!! At the same time had wasted spark ignition fitted to bring everything more up to date. Can almost guarantee 100% a massive improvement once the old wiring loom is replaced.