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Hello Dylan,
The sockets on the switch for the wires are riveted to a PC board type material and over time corrosion can build up under the rivet and the corrosion increases the resistance and causes a higher draw which causes heat.
You can try dunking your switch in a bath of CLR household cleaner overnight to remove the corrosion chemically.
FYI, new turn signal switches for 544 are available. Not cheap, but still available.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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