Hi Knxwledge
I am not sure about Your description in post-11. Here https://www.ipdb.org/showpic.pl?id=2253&picno=14407&zoom=1 below, between the flipper-bats is the "Shoot Again (Playfield) Lite" - in the ipdb-picture it is unlit. Here https://www.ipdb.org/showpic.pl?id=2253&picno=2145 (actually we do not see it in the ipdb-picture) on the bottom, middle is the "Shoot Again (Insert) Lite". Here https://www.ipdb.org/showpic.pl?id=2253&picno=14406&zoom=1 on top, middle we see (unlit in the ipdb-picture) the "Top Center Rollover Lite" with the invitation-text "HERE, WHEN LIT You can make an Extraball". See the first JPG --- first we must make the "Top Center Rollover Lite" lighted --- then when the ball rolls through the "lane at this invitation lite" - the Extraball-Relay is made to pull-in - the switch on the relay is moved - the invitation lite turns off and the two "Shoot Again Lite" light up - always both at the same time.
Just to entertain us: Williams mounted a switch on the Impulse-Cam - whenever the Score-Motor does run: Lighted lamp does somewhat "flicker" - somewhat flashing like an 455-flashing bulb.
See the second JPG - complicated wiring on the Extraball-Relay --- in post-11 You do mention "strange behaviour when playfield is lifted / up / lowered / down" - for me the first question to answer is "when does the Extraball-Relay pull ?" See my drawing of two lamps (in series) - mounted to the coil on Extraball-Relay --- whenever current flows to the coil: Lamps do light.
I call the two lamps "SteveFury-Test-Light" - two cheap 12Volt-car-bulbs wired "one behind the other" - 12Volt plus 12Volt sum up to 24Volt --- a very handy testing tool. Have long wires on the SteveFury-Test-Light" - clip on at the coil on Extraball-Relay --- long wires (on the Test-Light) coming out of through the open Coin-Door so You can see when the Extraball-Relay (mounted on the mech. panel in the cabinet) is pulling / non-pulling as the SteveFury-Test-Light is lit / unlit.
With the Test-Light mounted do toggle-on the pin - start a game - do lift the playfield - have lifted - do lower the playfield - do combinations of toggling on (playfield lifted or down) - then write about the behaviour of the Extraball-Relay (Test-Light) in Your Space Mission. Greetings Rolf
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