Last winter, I fitted an Autosparks loom to my 1939 - 14 saloon, it cost £250, money well spent.
http://www.autosparks.co.uk/product_inf ... ts_id=4623
It came in 4 sections, rear loom, front loom + headlamp loom, dashboard loom and roof loom.
At no extra cost, they also included extra wires in the loom for flashing indicators, high level
brake light, power socket under dashboard (these were all at my request. Everything fitted
exactly, all I needed to do on some wire ends was to attach the correct terminal.
They are very helpful @ Autosparks with any queries (speak to Debbie).
The wiring diagrams are all available in the P2 Workshop Manual, all the wiring loom colours were
correct to type on Autosparks loom. I only had one problem, the wiring diagram in the P2 Manual is
produced by Lucas. Their version of left and right side of the vehicle is opposite to what you would
think in relation to the trafficator wiring circuit on the car.
After connecting everything up, I connected a blade fuse holder between the battery and battery
terminal, used a 5 amp fuse and then started to switch individual components "on" then "off".
After everything had been checked and was working, I then started to turn everything on, but used
a heavier fuse. Of course also checked the ignition / starter circuit for function.
Hope this is helpful, Chris C.