Not the correct way to do it, as the relay does not isolate the ignition switch and circuit from the load imposed by the starter solenoid. The object of the exercise is to overcome voltage drop in the ignition switch circuit occurring due to a fault causing resistance in the circuit.
The relay contacts should switch the starter solenoid load as a separate independent circuit. The existing ignition switch circuit should be disconnected from the starter solenoid and then connected to the relay coil, thus limiting the load on this circuit to no more relay current. This arrangement will hugely reduce the load on both the inhibitor and ignition switch contacts where poor contact must exist.
