Normally the Generac generator feeds the whole house.
No fuse is tripped and I switched them all anyway (like everyone does).
What would make a generator only feed half the house? (if that)

At first it wouldn't go on automatically - so that may be a clue.
I had to switch it to automatic from manual and after a dozen of those
switches, it went on automatically.

I'm wondering how to debug the transfer switch but I opened both up and
they seem to be the same with no moving parts.

Any ideas?