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These blinker boxes work in tandem with the barrel shaped hazard switches with the central push button, spring loaded actuation. They are used, generally speaking on the 105-115 Spica injected cars. You can test them with an ohm meter but transistor/diodes can cause readings to be difficult to interpret without the precise spec.

It just so happens I’m looking for one of these for my Alfa so if you have a spare to sell or want help with the testing, please PM me.

Best of luck, Al
 

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My 74 spider has this. With age the electrolytic capacitors dry up and go way out of spec, the transistors and resistors rarely go bad but it is possible.
I replaced the 4 capacitors inside it by ordering them through mouser electronics (less then $10) and re soldered all the terminals by first removing the old solider and replacing it with silver solider. works great now, much faster blinkers.
 
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