HowardB

Cooling the resistor when used with indicators is not a serious as it only heats up when the power is applied - it will easily dissipate 10 Watts. However the point about temperature and coming into contact with materials that can be damaged is a valid comment and I should have mentioned it. Its a much more serious issue if your indicators can also be used as Hazards when they may be left on for extended periods.

You can avoid changing the flashers by installing a 6.8 Ohm 50 W resistor in parallel with the LED bulbs. RS Components can supply them https://uk.rs-online.com/web/p/chassis-mount-resistors/0160922 . This does work and until I get round to sorting out the wiring on my TR7 V8 conversion & refitting the electronic flashers I am running with a resistor between each of the rear indicator lights & earth.