First, my wife went to med school at Otago Uni in the 80’s. Someday, she hope to return there for a visit, and me, see it for the first time. She keeps showing me photos of the Uni, and it looks beautiful.
Second, beside checking what was in the previous post, how old is your antenna? I see you said you have a GA35. Garmin years ago turned out a batch of these antennas that failed, and many had to be replaced for free. Check your serial number and see if it was in that batch, and if so, get it replaced.
Third, check all your connections to all the can-bus modules, and be sure if the GPS is at the end, that it is terminated correctly. The Unit Status LED steady green means the unit is powered On, but not communicating via CAN Bus. The GPS status flashing slowly means you unit is acquiring a position with good signal to noise, but has not locked on. When it flashes fast, you are locked on.
Now, it is not locking on, so the areas to look at are the antenna, coax between antenna and GPS, or the GPS unit. You also could have a bad antenna or GPS. It also is saying you have it powered up, but it is not communicating via the can-bus either.
First find out why you you are not communicating with the GPS via the can-bus and get that light flashing. That might fix the problem, if not, you have one problem fixed. Then check out the coax next, then the antenna.
If you want some more help, email me directly at email@example.com
, and we will see how to get you up and running.