What wire should I use to extend my wiring about 12'?

I always use 6 ga. for trolling motors.

I always use 6 ga. for trolling motors.

 

X2

Awesome, thanks guys!

Finding the wire can be a challenge. As an option you can get long jumper cables, just check the gauge of wire.

Oh and if you're extending instead of replacing, solder the wire together, then cover that with heat shrink

Oh and if you're extending instead of replacing, solder the wire together, then cover that with heat shrink

I was going to use liquid electrical tape and tape over that as well. 

I'm not familiar with liquid electrical tape, as long as the connection is solid and the covering as water tight as possible you'll be fine.

I'm not familiar with liquid electrical tape, as long as the connection is solid and the covering as water tight as possible you'll be fine.

 

http://www.plastidip.com/home_solutions/Liquid_Tape

awesome, thanks guys. I used 6 ga, coated it with liquid tape, then wrapped it with regular tape, done.