My Ruby has the standard semaphore indicators and I now want to add flashing indicators front and rear. My question is: Can I wire in a three spade flasher relay so that it operates off the original self-cancelling switch on the steering boss but leaves the semaphores still working? The switch is wired to the original four way junction box which then runs to the semaphores. I am trying to avoid having a separate switch for the flashers...

Nick,
I think that, in order to use the existing switch, you will have to install two flasher units, one for nearside and one for offside. These can be connected to the existing semaphore indicator feeds. You may have to check loads if this circuit is fused.
Bryan

Thanks Bryan. Much appreciated. It was only after posting the question that it dawned on me that the relay provides an intermittent current which the switch directs to either side. So to keep the semaphores from flapping at the rate of knots it would be necessary to feed separate left and right relays from the junction box... I'll give it a go.