False alarm…turned out to be very bad contacts on the indicator stalk…
Bad contacts are a common problem with these combination switches, arising partly from the design and the oxidation of the crimped & rivited connections.
I suffered one MOT failure, because the dip switch failed during the MOT inspection, having been okay in the days, weeks & months leading up to the event!
Ideally, the crimped wires should have been lightly soldered where the bare-wire crimping was done, then strain-relieved and sealed using hot-melt glue & heat-shrink sleeving.
Nigel A. Skeet
Independent tutor of mathematics, physics, technology & engineering, for secondary, tertiary, further & higher education.
Upgraded 1974 Triumph Toledo 1300 (Toledo / Dolomite HL / Sprint hybrid)
Onetime member + magazine editor & technical editor of Volkswagen Type 2 Owners' Club