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Yes they are labeled on the floor of the cube, just not super easy to see. Thats where the TM callouts help as well.

Thats the correct relay for the 5 right hand units. The first (leftmost) position is a switch: SPS-100-88-21091 I would recommend Kurt Klopp's unit for the first position: https://steelsoldiers.com/threads/mep-802a-mep-803a-s14-relay-5930-01-396-2940-88-21091.200402/

Yeah its not going to do anything with those little plastic boxes missing. The leftmost unit is a switch, the rest are all identical relays. Hopefully you bought the right units.

I think you need your own thread on this, is if doesn't already exist. Anyone can test almost anything in these machines if they have three things: 1.) Appropriate Technical Manual 2.) A handheld multimeter 3.) Eyes, Ears, and Hands Even the third may be optional, but helpful. For the 803A, I...

Do you have the color coded 10kw wiring diagram TM? Test along the starting circuit until you find the issue. Have you tested the cranking relay?

I believe TB4 is on the sheet metal wall behind the S8 phase selection switch. You will need to remove the operator control cube roof to get to it. You should buy a couple of cans of a high quality deoxidizing spray to aid you in getting this machine going. The S1 may not be bad... might be...