Originally Posted by Piper J3
A friend's RV-12 built by Synergy had Dynon GPS antenna wire cut through. Hole in mounting plate did not align with wires exiting bottom of amplified antenna...
Just so everyone is clear, the Dynon GPS (at least the SV-GPS-2020) looks like an antenna but is actually an antenna and GPS receiver all in one. It looks like a traditional GPS antenna but note there is no coax running to it, only wires. What comes out of it is NMEA serial data. It is a small nit but I find it helpful to have an accurate mental picture of the system configuration when considering failure modes. BTW, this and all the other comments are good ideas on troubleshooting.