Help! Wacky Gravity Ballast Issues

[sandm]

6 pumps is aftermarket as mjh calls out. trace wiring back and you will likely find the issue.

you have option 4 that mjh didn't mention. 3 fill, 1 for each bag and 3 drain, 1 for each. this is how a lot of current boats are set up to operate(not current skiers boats with reversibles). once you know the wiring then troubleshooting can begin but need to know the whole wiring path from where each switch goes to AND where they are drawing power.

should also ask by not working do you mean not filling or pumps not running at all. if not filling depending on plumbing that could be vacuum issue. not running is electrical and trace wiring as mentioned.