I had a rear indicator fail yesterday and got the fast flash.
Turned out to be a bad earth to the metal backplate, might be worth testing the earth with a fly lead. Strangely i could interrupt the earth by screwing to plastic lens up tightly.
Front Sidelight failed at same time, cured by tightening fixing bolt, so bad earth again.
Both issues unrelated, but i put it down to heatwave… or black magic.
