Is there anyway to reduce the voltage in a wire?  I am looking into putting a lowrance on the front of my boat but I am not sure if I have any 12 V supply up there.  I know the 24 volt system for the trolling motor is up there.  My boat is very hard to run wires through, requiring nothing short of a deck disassembly to get it done.  So I was wondering if there was a way to run the 12 volt chart off of the TM's power?

:-/Try typing into your browser (24vdc to 12vdc converter) . You will find several possibilities. You should look for one that will provide 12v at 2 amps or more, and is suitable for mounting on your boat. I found them from 17 bucks to over 50, so look around. Most of them will require a dry environment.

What year and make of boat?