This important part in the electrical system carries out one basic task, to allow the correct current to reach the correct electrical items, in this instance the R WINKER. If this is not working correctly or has broken down - and they do go brittle and degrade over time - then renewal is the best option!
Replacing this part would normally be carried out during the course of a general electrical overhaul. For all your electrical consumables, such as ignition coils, spark-plugs, condenser assemblies, regulator/rectifiers and much more, check out the schematic and 'Product Gallery' for your model.