I think you will need to be much more specific with what you have to really get a good answer.
Things like which set of batteries are you speaking of? Coach or start? From what I see, about all we can say it that the cables going to the frame should be ground cables. One runs across and one upfront? That leaves me in the dark as to what is on the other end?
Part of the trouble will be in getting good drawings on that older year if before 1990.
But there may be some help heras thingtend to stathe same for a time.
Does this drawing for 90 seem to match what you have on the coach batteries?
It look like a battery on each side with cables to the frame as ground and then a cable going across from positive to positive post and that would seem to make those the battery set for the RV/ coach items.
But I do not spot the start battery?
On a second drawing in the second snip, I do see the start battery wiring and it does have the mode solenoid shown. That is where we expect to find the coach and start batteries connect together through the solenoid, so I think we can "assume" the marking I did in blue? This solenoid is what operates when we push a dash (boost or aux) switch to give a weak start battery a "jump start" or when the engine is running the solenoid also operates to let the engine alternator put some charge in both the coach and start batteries aswe drive.
Any chance your cables still have the tape at the ends to help ID their use? They tend to fall off over the years.
Maybe see if that matches what you have and maybe some help?
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