1994 Cal Spa

What do you mean working on it? is it your spa? a customers?
who makes the controls? you said ps-4, that sounds familiar, but need more info if you can.
What are you trying to do, fix the spa? etc. it sounds like you have a lot of wiring issues,or missing components based on your request for pic and/or schematic.
I generally wont suggest any repair or upgrade strategy to a customer on a spa that old.
So make it more clear as to your intentions with the spa, keeping in mind the likely hood of something similar to yours is practically non existent as old as it is.
 
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