We're currently running a Vertical Power PPS and attempting to tie the fault lights into the GAD27 discrete inputs. The PPS is meant to output 12V to a fault light on the dash when there's an error. We setup the GAD27 with discrete inputs, active high. The problem is, it's always showing the faults are active. The PPS and the VPX have a habit of putting phantom voltage on the line unless there's a load on it, and I'm wondering if this circuit needs a pull down resistor added in order to make it operate correctly. I've contacted Astronix and they've suggested I contact Garmin. Hoping someone here has done this before, or that G3Xpert can chime in. Thanks.