You should buy yourselves a test light. Multi-meters are good 95% of the time however once in a blue moon it will give u a ghost voltage and tell u that you have power there this is because a multi-meter doesn't apply a load to that voltage like I light does. Also when testing fuses with a multi-meter on ohms u can still get a tiny connection that will make it read fine however that connection won't handle the load of whatever it is supposed to power. Test lights are cheaper and more reliable for automotive fault finding