Need help identifying unknown electrical component under the dash.

Hello, I’m new to working on older cars and this forum. I’m working on my first car, a 1973 Dodge Dart Sport with a 318. I have been having electrical problems and have slowly been checking my voltages and replacing dry rotted components. I came across this relay/diode that has no name or part number on it. I couldn’t tell what it is from wiring diagrams or find it after searching online. It is cylindrical shaped and has yellow and pink wires leading into it, the issue I see is inside one of the tiny wires is broke in half. Thanks in advance for any help.

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