I have a new multimeter that I've tested the voltage of a 12v flooded lead acid battery with before.
Today I tried to test the amps running on the battery, to see if there was parasitic draw. As instructed, I disconnected the negative terminal on the battery, and connected the multimeter in series (red to trailer, black to battery). Nothing. No reading, and no power in the trailer.
Is there a way to test if I'm just doing something wrong or if the device is broken?