Not sure what you are rewiring, but #10 is probably too small for a trolling motor and too large for a typical depth finder or two. If it is sonar units, you can make your own twisted pair with some single strand #16 or #18. Cut it about 3x as long as you need and stick the ends in a cordless drill.
Here's my line up at the bow.
1199....... 1.3amps
HB360..... .360 amps
Ethernet switch .165amps
Total 1.825 amps
I have these running on a 14 gauge wire which is probably over kill since it is good for 15amps.
You may be doing something completely different. If so you can disregard the above. Hope you get it all worked out the way you want to do it.
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