Subject: Re: New wiring loom for V12 drophead coupe
Hi Laurence
Have you thought of making your own wiring loom ?
It is not as difficult as you think as long as you are methodical.
The advantage is that you can incorporate improvements ie indicators and also spare wires (eg front to back). There is a major advantage also by going to a more modern wiring system as you can then use relays - these will protect 80 year old switches from carrying high voltage and excess heat. If the old switches are not very good and the internal contacts are not brilliant you should be able to avoid future problems.
The old switches then just switch the relays which carry the load. The relays are switched with only a minute load thereby preserving the old switches. There is no need to see the relays which can be hidden away out of sight.
Once you have made up your own loom you can then take it off the car and get it braided to give it a "professional touch".
In my view I think it would be silly to follow an original wiring diagram. If you go to a modern relay based system you can also incorporate a good selection of fuses on the different circuits. That is the advice I was given some years ago by someone who knew far more than me and is one of the best ways of protecting your Lagonda.