[David C]

I was sufficiently impressed with the new LEDs from Classic Car LEDs that I fitted to the 406 that I decided to do the 410 as well.

Changing the indicator bulbs to LED requires a new design of electronic flasher unit as the LEDs don't draw enough current to operate the old mechanical flasher. This is a straightforward swap just requiring the modern replacement to be earthed.

Less straightforward, however, is the hazard flasher. It has an unswitched power supply and works by switching the load. If replaced directly by an electronic unit this would permanently be switching. The answer is a current sensing circuit absent from any flasher unit I can find. I have, however, found what looks to be the solution. The RLHM module from Retronics. Not particularly cheap at about £50 but the simplest fix I could find.