Should work as long as it is sharp. Did not know you had that or I would have given you better tests. Substitute any test for 12v to use the test light. Test lights are much better than meters for testing 12v because they requires some amps to light the bulb. Not a lot but a meter requires much less. There have been times that I have read 12v on a meter but the test light may not light or lights very dim.Sometimes you can find a fault because of how the bulb lights.