The same thing happened to my MK4 Polo - the flasher relay had to be replaced. I took it somewhere (i am hopeless at fix-it-yourself) cost about $40. When i pressed the hazard light button, it ticked normally. The dash lights (blinker ones) would flash dimly but the actual light bulbs on the car wouldn't turn on unless i asked them to (hope that makes sense - i'm not technically minded at all...)
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