Quote Originally Posted by Cracker68 View Post
I had some old HP fish finders. I took the power cable, (exact same one) and took an inline fuse, twisted the wires up and hooked it to my battery pack (the kind you jump start a car with) and used the clamps to hold the wires. Worked like a charm. Figured it was just like what was in my boat.
This is what i did too, it's works great.