That circuit can be confusing. You should have a back contact of 39A I believe to start you. Check that guy and check that none of the relays are residually holding in. Also check that relays are not "halfpicking" while energized! You will also have 81U&81D relays for direction in circuits. Also check your power supply to be sure your outputting enough for the relays. You are losing selector right away. I doubt it's tape switches, more likely on the controller and since it's directional look at 81U's. Another good one is cold solders on back of relays? Have still found cold solders 40 years later! Timing is everything in these circuits!
