I am working on a battery charger for a friend. The out put transitor and fuse were blown. It still does not work so digging further, I found this component attached to the heatsink of a schottky diode. I think it must be a thermal fuse but wondering how to get a value? On the circuit board, it is labeled as RT1. It is about the size of a 1n914 diode. It tests open. Any input for me? Thermal fuse? It was clamped onto the heatsink near the TO220 case schottky
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