I'm now setting up my control box and want to know how to set one of the meters , do I set it up for the tb6600 or for watching motors, either way I don't know how to do this, I fried one unit already, my meter is 5 wires ,dsn-vc288 thanks it reeds amps but no volts,but if I add yellow wire to red incoming 12v it will read 12v but I'm trying to read the20v one