Where is the fusible link on a 1953 Mercury?

Not absolutely sure but check this out, back them they didn't have an obvious fusible link like we have today. They used fusible wire instead (a short portion of wire put in line designed to fail when loads were exceeded) check the wiring harness near the battery, it should be in the first few feet from the battery. Also sometimes located on the fender well by the starter solenoid.