PPS. I just had a idea to check whether the hazard switch is at fault whilst watching the Giro highlights (come on Ineos Grenadiers!). If you don't have a spare switch to swap out then disconnect the old one from the loom and connect:
a. a jumper from terminal 30 (be careful, it is permanent live) to terminal 49 of the block, and
b. jumpers from terminal 49a to both the L and R terminals (again on the loom, not the switch).
That will replicate the switch being closed - if the hazards work and the flasher relay stops buzzing (starts clicking slowly) then you will know the issue is with the switch. Einfach nicht wahr?
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