1620 lowe battery setup (wiring)

[mylowe]

Acquired a 1992 lowe 1620. Its looks like its setup for two batteries' I'm assuming the heaver set of pos and neg go to one battery. Then there's a smaller set of wires red/black not sure where they go. Also have a set of heavy what seems to be ground cables that I'm not sure where they go. any help will be most appreciated.

 

[alldodge]

Welcome
We might need to see what your talking about with pics

Many boats of your size would have had a trolling motor installed, need to trace the cables and most of us are unable to crawl around on your boat from the net