I am using a voltmeter on the two connectors coming to the light bulb. I checked the fuses in the fuse box and they are all fine.
I wouldn't do this. Leave the - lead on a good bare spot of metal on the vehicle and move the + lead. Check that bare spot of metal by moving the + lead to the battery positive post, you should see ~12V if that's good ground.
You need to reference the V to ground and you don't know if the other lead in the lamp is a good ground, it could be corroded or the switch that supplies that ground could be bad.