Here is an extraction of the turn signal wiring I made. Wire colors may deviate slightly but you can get an idea of what you have and connections in the switch. You should be able to run the wire directly from the brake switch to the stop light filaments and then keep the 50 switch routed to flash the turn signal bulbs.https://www.packardinfo.com/xoops/html/downloads/wirediagrams/Turn%20Signal%20Extraction.pdf
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