So I got the unit brand new at a pawn shop. Paid 100$. It's the first fish finder I've purchased and will be putting it on the sonar pod of my feel free lure 11.5.  I know I need a 12v battery. How do I hook this cord up to it?

Red to positive Black to Negative. don't need to connect the others.

Ok so just tape off the other two... that works. Thanks.  What's the best way to connect the wires to the battery terminals 

Well assuming you have a Marine battery you can use a Ring terminal to connect them Pictured below.

 

 

If you just use a regular battery you could use universal marine battery terminal adapters to be able to use the ring terminal.

 

 

I'm just looking to hook it up to a 12v 8ah battery nothing that large

Get a crimping tool and waterproof connectors. Take the battery to a home improvement store, and they'll help you with gettinntr right stuff. You'll want to also get an inline fuse. 

This is the battery I'm going to use.  

For that type you need this connector

 

 

 

21 minutes ago, LoweStinger said:

For that type you need this connector

 

 

 

Awesome thanks any idea what there called?  And I can get them at my local hardware store.  Sorry I have no idea what I'm really doing here.  

Try an auto parts store

 

 

oe

You can get these at any auto parts store or Lowes / Home Depot hardware stores. Its called a " Female Disconnect " You will also need a wire crimp tool to fasten to the wire. Might be a good idea to just bring your battery and wire harness with you.

All set up thanks for the help everyone.