[Elecraft] Adding KPA100 to KAT100-2

[Tom Z]

I am finally getting around to moving my KPA100 from the K2 case to
the EC2 enclosure that houses my KAT100 tuner. I must be missing
something obvious - basic K2 appears to work but never accesses ANT2
and none of the KAT100 SWR lights work (although the AN1/2 LEDs do
work, and think they are switching).

Here is what I think are the connections:
Internal to the EC2:
AUX connector on KPA100 to AUX header on KAT100 board
AUX 12V connector on KPA100 to AUX12v connector on KAT100 board
AUX RF connector on KPA100 to AUX RF connector on KAT100 board

External connections:
12V connected to K2 and KPA100 (but not to KAT100)
AUX/IO connector from K2 to KPA100 AUX/IO connector
K2 ANT OUT (BNC) to AUX RF (BNC) on KAT100
KPA100 RF OUT to KAT100 RF IN
ANT1 and ANT 2 to my antennas

When I try to tune, the KAT100 relays do some clicking, but no SWR
LEDs illuminate. The first time I tried this, I had the KPA100 ANT
connector open - so hopefully I did not damage anything (was running
only 20 w TUNE for a few seconds)

Possible error - do I need to connect the external AUX connector to
the KAT100 connector, instead of the KPA100 connecotr?

Any help appreciated.

73,

Tom KG3V