It was of course fuse #10 which provides steady lamp to cards 1, 2 and 3 in program A mode according to the ITT documentation, but since I am using a Stromberg Carlson model which is slightly different, I believe #10 feeds cards 1, 2, 3 and 4.
Added a BLF to the mix today and realized that I either need a lot more 1A1 KTUs like the 227B that I can use the relays from, or a good supply of 24V bulbs.
