Review on Motorcycle 12 24V Digital Voltmeter Ammeter by Bob Souza

What can I say. he does what he has to! The biggest surprise. No voltage turns on unless the main voltage is hot. The auxiliary voltage can be hot, but nothing is displayed. It was ok for my application and I actually prefer it that way. When I turn on the ignition it feeds the main wire and the auxiliary wire is always hot from my second set of batteries. .There are no instructions, but common sense will prevail. "-" is negative and differs in color from other lines. Positive channels correspond to their position on the manometer. top to top and middle to bottom.