That's right. Now you have isolated the problem to the relay and only two things can be wrong: either the relay's coil isn't energizing (due to an internal broken wire) or the high-current contacts are being drawn together but no current is passing through (remember high-resistance connections?). If the coil is bad the relay must be replaced. If the contacts are charred, file them smooth.
Bad connections can happen for a variety of reasons. As wires carry electricity they get hot, so it is possible after a lot of use for a connection to melt and no longer make contact. If the connect is outside of the cabin of the car it could get rusty or dirty to the point where electricity will no longer flow. It is also possible that from use and vibrations the wires simply disconnect. In this case you need a wiring diagram for your vehicle, a circuit tester and a lot of patience.
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