The DUVAC terminal is a remote voltage sensing wire for the alternators regulator the wire connected to it should have 12 volts + And is connected to the alternator out put with a jumper wire or connected directly to the battery bank positive or to a voltage sense terminal on a DUVAC isolator setup for dual voltages.. The standard Leece Neville alternator is a "four wire remote sense externally excited" alternator, commonly known as DUVAC. There are a several options for replacement, here's a link to the technical support forum for Leece.
![[DIAGRAM] Deutz Alternator Wiring Diagram Motorola](http://theamcforum.com/forum/uploads/119/ALT-WIRING-OPTION-Post.jpg "[DIAGRAM] Deutz Alternator Wiring Diagram Motorola")
The diagram I posted was from CountryB's post and it shows the right terminal on the Leece Neville as "remote sense wire to battery isolator or DUVAC system -S terminal".. The protected output accessory loads should never exceed maximum DUVAC amperage rating, even momentarily. 5. Connect the ignition terminal to a 24 volt (or 12 volt) ignition source. This circuit activates the DUVAC® II only - it does not act as an ON/OFF switch for the 12 volt accessories.