OP

Quoted from DavidPinballWizz:

So I have a 'right flippers' problem on my Bally Elektra.
The 2 (upper and main) right flippers stopped working during play.
I opened the playfield and a wire from the lower level playfield was loose from the right coil.
I soldered it back (correctly) with the game shut down but no change.
Also when the game enters the lower elektra playfield after ball bonus, also only the left flipper works there.
I measured voltage on the coils and have 43V DC on the outer lugs of all right flipper coils. (not on the center lug).
If I read the schematics correct, there is no transistor that drives these flippers? Only the 'flipper enable' relay? And the one that switches power from upper playfields to lower playfield.
What could be wrong here?
ps: right flipper button has wires still hooked up and is making good contact (visually) haven't tested further on the switch

OP

Quoted from DavidPinballWizz:

So I investigated the problem a little further this evening. Keep in mind that one wire had fallen off the lower playfield right flipper coil, so I expected a short that had damaged something.
1) Remeasured voltage on my upper 2 playfield right flipper coils: All lugs had 43V DC on both flippers.
2) Took out the solenoid driver board as I expected a blown trace or bad relay (the relay has 2 contacts, one for the left flippers, one for the right). No blown traces, good continuity between the J1 and J2 pins (flipper switch returns and voltage to flippers) and from the relay
3) Took af the relay cap and simulated the on off positions of the coil --> good continuity
4) Started to investigate the flipper button cabinet switch --> switch works as intended
5) Measured continuity from the flipper buttons switch to the connector for the solenoid driver board
Well I had no continuity! I compared to the left button switch and there it was as expected.
Plugged the game back in, wiggled the connector/wires for the cabinet flipperbutton switch return and bingo.. a little spark in the connector and the right flippers worked again.
So repinned the connector and I have working flippers again (All 3 right flippers now work ok).
So funny how a wire that had fallen off the coil confused me to think in the last possible reason that the problem would be in the flipper button return switch.
But fixed and now I know how the flipper circuit works on the older ballys
Big thank you to zaza and metalkatt for the schematics and thinking along with me