I am installing a dash cam in my 2011 Ford fusion and hardwiring it to my fuse box. in the instructions it says it must be connected to a constant fuse and a switched fuse.

I have a test light and when the car is off and the key is out of the ignition some of the fuses light up as they are constant. when I put the key into the ignition and turn it to the on position, none of the fuses light up at all. Even the constant fuses that I tested earlier do not light up.

Am I doing something wrong here?