I have a car radiator fan which when measured with a multimeter on a 12v car battery draws 4.7a. I've been trying to run it off an old PC SMPS which is rated at 450W with max amperage of 18a at 12v. The smps doesn't start when i connect the fan to the power supply while the smps fan starts running when there is no load. What would be the problem? Can adding a capacitor make the radiator fan start working - if yes, what values should the capacitors be? What is the right solution to get it working?
Thanks in advance for the answers. Please help.