No. If it's showing 0V (is measuring voltage) that means that no volts are getting through the fuse.
If a fuse is showing 0 Ohms (is measuring resistance) that means the fuse is good, in that it has no resistance, and should pass current when connected into a circuit.
It is very easy to have a meter set to measure the wrong thing that you are looking for.
He was measuring across the fuse. If it's good he will get 0V, assuming there is 12V getting to the fuse. That's why I suggested measuring the voltage at the fuse from a ground point. A quick check for voltage on both sides of the fuse will tell him if the 12V is present and if the fuse is good.
