SkyView System Installation Guide - Dynon Avionics

19. Appendix C: Wiring and Electrical ConnectionsSkyView utilizes standardized network connectors and wire harnesses forequipment-to-equipment connections as well as other connections. Installersshould rarely have to build custom wire harnesses. This appendix is included as areference for those rare times when custom wiring is required.Improper wiring can result in permanent damage to your instrument and/or theaccompanying sensors.Make all connections to your harness before plugging it into any of thecomponents of the system. Do not make connections while power is applied atany point in the system.Wire GaugeUnless otherwise specified, 22 AWG wire is normally sufficient for the power supply and groundlines, but we recommend that you consult a wire sizing chart to determine the size required forthe wire routing in your particular aircraft. Ensure that the power lines include a circuit breakeror an appropriately sized fuse for the wire you select.Smaller gauge wire is sufficient for lines that only carry data.FAA Advisory Circular AC 43.13-1B is an excellent resource for wire sizing requirements as wellas other acceptable methods, techniques, and practices in aircraft inspection and repair.GroundingMany of the engine sensors require a connection to a ground on the SV-EMS-220/221. Thereare many places on an aircraft where you could connect these sensors. However, the ideallocation to ground these sensors is to one of the SV-EMS-220/221 ground pins. Connecting thesensor’s ground pin directly to the SV-EMS-220/221 minimizes any voltage difference betweensensor ground and SV-EMS-220/221 ground.You can measure the voltage difference between grounds to check if theconnection has a minimal voltage drop. Set a multimeter to the DC voltages settingand place one probe tip on one ground and place the other probe tip on the other.Measurements close to 0 mV (within 5 mV) are, in most cases, acceptable.Other grounding recommendations include:Ensure that solid, thick electrical connections exist between engine and battery ground.Do not paint over surfaces that are ground connection points.SkyView System Installation Guide - Revision O 19-1