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Hey guys I have a 1967 mustang coupe and curious about a bad ts switch.

Is it possible that the turn signal switch can make the ts flasher to go bad? The switched 12v wire in the ts harness loses power every time I install a new flasher and try to activate the turn signal. Could it be a bad ts switch to blow the flasher? Let me know what you guys think, thanks!
 

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More likely someone has messed with the wiring.
Get yourself a diagram and start tracing wires to their locations.
 

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Could be a number of things. Best to remove the steering wheel and clean/ lubricate the turn signal switch. Use electrical contact cleaner and cycle through to clean, air blast dry then lightly lubricate with silicone spray.

Get an electrical diagram and test each part of the circuit. Check then re-check the grounds.

Lastly, buy a quality flasher. So many of these things are made in China and are defective out of the box. Try this one from Rock Auto:
 
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