Blower fan fuses all good. How can I diagnose blower motor issue w/o multimeter?

What is your question?

Blower fan turns off and on intermittently for almost a year - sometimes it'll turn on with ignition but not often. Sometimes it'll turn on suddenly while I'm driving but then once I turn the car off, the fan won't start back up again the next time I restart the car. Even if it's only been a few minutes. When the fan does turn on, AC and heat work fine and the fan will work on all speeds. But 85% of the time fan doesn't turn on. Checked fuses under hood and inside car and all are good. Cannot locate blower fuse relay though, only the fuse. Need to repair this myself to save money but don't know what else I can do diagnostically without having a multimeter or voltmeter.