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Ouch, a new turn signal flasher relay is $65 at the local parts shop. Is it possible to DIY a repair of such a flasher relay?

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Yes you can often repair turn signal flashers!

A variety of things can be wrong: here's one of them. Solder joints on the relay printed circuit boards are especially vulnerable to stress cracks, due to the clicking motion day in and day out.

Take the case off the relay and use a jeweler's loupe to inspect for hairline cracks, especially cracks those that go all the way around a pin that is shaken by the relay clicking. For example:

Bad solder joint on car flasher relay Stress crack in solder on flasher relay pins

To repair get a soldering iron fairly hot, melt the existing solder until it is fully wet, release cleanly, and let the solder form a nice shiny fillet. This is a very easy soldering job even for beginners.

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  • Nikon D40 with standard kit lens, @cdunn. I could take a better picture, but this better represents how subtle these solder stress cracks can be.
    – Bryce
    Commented Feb 24, 2016 at 5:13
  • So does that crack go all the way through the solder (not just the surface layer)? Commented Jun 30, 2016 at 21:15
  • @RockPaperLz-MaskitorCasket yes that crack went all the way, and fixing it repaired the flasher.
    – Bryce
    Commented Mar 31, 2021 at 7:40
  • That question has been keeping me up at night for almost 4 years. Thank you Bryce for allowing me to finally get some good rest tomorrow! :) :) :) Commented Mar 31, 2021 at 8:26

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