Today i got an LMS 330-C fishfinder at a garage sale for only 10 bucks! I think it came with everything i need. here are some pics:

 

 

 

 

In the last image, you can see the power wires. these wires don't reach far enough apart for the battery. Is there any way that i can extend them?

 

I'm not sure I understand your question.  If you are referring to battery terminals that are simply farther apart than the two cables, why can't you simply cut the cable sheath and separate the two wires?  

 

Or did you mean something else? 

If that works, you got a steal! To solve the issue of the wires, just cut the black sheath that holds the wires together. Be careful not to cut the wires themselves, but you can cut that back. You'll want to wire in a fuse holder to the positive (red wire) and install the recommended size fuse. It should be in the book, if it came with one. If not you can download the manual on Lowrances website. Get that baby hooked up and enjoy!

 

Edit: After the first pic finally loading, you have a fuse holder that's right under the locator.