Turn signal problems on 75 duster

I tore the dash apart and found a flasher in the dash that I wasn't aware of. I replaced it with a new flasher and the turn signals are working properly now. But the hazards only work if you have the turn signal on as well. I also found a flasher 552 in this plug (photo below), it states in the book that it is a plug for the map light switch. But I can't find what it plugs into? Or does it plug into something else?

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