lower relay resistance

Hi to all. my AC compressor was using a magnetic valve with a resistance of 11 ohms I replace the compressor with a magnetic clutch now I must use a relay to send a high current to the clutch it's only operating the compressor and not the condenser fan if I disconnect the relay and plug the magnetic valve every thing works if I connect direct to the compressor coil every things work but it will burn the compressor coil because the current in this circuit is to low. How can I lower the relay resistance ??