1. Where did you put your L2 antenna? I did fine putting it in the nose
after
shaping a balsa piece to fit.

2. How did you route the coax? With a lifting instrument panel you have to
be
careful the coax does not get mangled by adjacent hardware.

3. Are the coax connectors secure to the conductors, especially outer?

If it gets to the point that you might have to ship it out for diagnosis,
it might
help to hook up the removed components to a battery. If there's a major
airport within 50 miles you should see replies to TCAS interrogations from

the heavies. You don't have to be in the air to receive TCAS
interrogations.

But do double check the harness plugs are seated properly before doing
anything else.