Where do leads go on voltmeter?

Insert the test leads. Each has a metal probe on one end, and a metal jack on the other that slots into the holes in your voltmeter. Plug in the jacks as follows: The black jack always plugs into the hole labeled COM. When measuring voltage, plug the red jack into the hole labeled V (among other symbols).

How do you wire a battery gauge?

How to Wire Voltmeter Gauges on a CarFind a mounting location for the voltmeter; under the dash usually works. Use 16-gauge wire for the hookup if the wire was not provided with the voltmeter kit.Remove the bottom of the dash to gain access to the harness. Confirm that you have a good constant-on power wire.