Had an issue recently where my right hand blinker wouldn't work on my 180b.
Hazards worked proving globes weren't the issue, so had to be something with the stalk. I tracked down another stalk thinking it would solve the issue, pulled the steering wheel off, chucked the replacement on, same problem.
Having the time to investigate was really the factor in just getting another stalk, but since the replacement didn't work, had to look further.
Took the car to a fellow Datto man with a lot more electrical knowledge than myself, he chucked the multimeter over the thing and confirmed that there wasn't much resistance getting to the blinker terminal when it was engaged to the RH side.
Turns out 40years of use and gunk build up finally stopped the blinker working, so a quick disassemble, clean, scratch and reassemble proved a winner.
180b stalk
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The back of the stalk
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Behind this section is the area that activates the blinkers, remove the 2 screws being careful not to lose the little ball & spring.
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You can see the little bridge component on the left that activates the terminals on a see-saw type setup when the lever is pulled.
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Pull the metal off and shows how dirty the contact points are.
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Bit of Contact Cleaner on a rag and a quick wipe, looks alot better. You can still see some markings on it, so a bit of really fine wet n dry would have been good but I didn't have any. Don't use anything to rough as the brass gets hacked up really easily.
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The 1600 stalks are pretty similar from just looking at it, so same thing should probably apply if you are having issues, good bit of maintenance either way for better reacting blinkers.