I can't opine on the Marine Trader specifically, but I'm coming up on one year of owning the 1980 Praire pictured here.
For the most part, the systems are similar on all our boats, so ask away, someone here can probably help.
You'd be surprised how many manuals for individual components can be found on line. The hand-typed "manual" that came with my boat WAS in the package I got from the PO, but it really didn't help much. There was a whole thread here on writing your own boat manual as you learn the systems.
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