I am trying to use the internal gps on my HS Sport to feed gps data to a ACK E-04 ELT with no luck. I fabricated the test tool specified in the instructions for ACK and I am not get any light or flashing with the test tool. I have port 3 set for 4800 baud and the serial wire is connected to pin number 32 of the HS Sport. I installed the jumber on the curcuit board in the ELT for the 4800 baud rate. I did connect a volt meter to the serial data in pin on he plug that connects to the ELT and to the ground. The volt meter jumps from around -5 volts to positive volts. Any ideas on what to try or check next?