Almost everything in a car is wired through a fuse. Fuses are designed to fail when too much current is drawn through the device. This prevents heating of the wires and subsequent melting of the insulation, followed usually by fire!
If the fuse is good and the relay is working correctly then you’ll need to get out a voltmeter and find out where you’re the interuption is in the circuit. You will need an electrical diagram that shows where the electrical connectors are that have wiring for your part.
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