Quoted from YeOldPinPlayer:Compare your 5.9 ohms reading to the expected value. I use https://www.flippers.com/coil-resistance.html and https://www.pinballmedic.net/coilchart.html to find the expected resistance.
Also double check with your manual and/or the other two pop bumpers that the correct coil is installed.
Those are great resources, thanks @yeoldpinplayer!