The heater in my 1948 Chevy 3100 truck isn't working. I traced the hot wire from the blower motor and found the other end loose. It was soldered so I knew it broke loose from its connector. Well I found the connector. It has a fusible link connected to the ignition switch. I disconnected it from the ignition switch and it has a 14A fuse in it. My truck has been converted to 12V yet isn't a 14A fuse typical with a 6V system? What do I do? I have looked at the different part suppliers and cannot find the fusible link that plugs into the ignition switch.