Two separate things going on there.
On the module issue - are the lights on the ADAHRS and ARINC module doing anything at all? If they're not lit or flashing at all, then something is likely up with the wiring. If they are lighting up and/or flashing, you should get in touch with our tech support directly for some more personalized assistance.
As for GPS. Your 430W and SkyView GPSes aren't dependent on each other for GPS. There are three things you need to figure out here, independently:
-Is SkyView receiving data from the SV-GPS-250? To answer this, ensure that the serial port that you've connected the SV-GPS-250 to (usually serial port 5) under SETUP MENU > LOCAL DISPLAY SETUP > SERIAL PORT SETUP is showing activity on the "RX counter" and "good sentences" lines. If not, there's probably a wiring problem.
-Completely independently, your 430W has its own GPS antenna/receiver. So next, you need to sort that out (with help from Garmin, etc)
-Once you have the 430W receiving its own GPS signal, then you can sort out connecting it to the ARINC module (once you have that sorted out) and getting the GPS guidance from the 430W over onto SkyView's HSI.