Old Buddy if your trolling motor is pulling fine but the battery falls off fast,I think the wire is big enough. Try to charge slower, like 2 amps to get a deep cycle on your battery. If your wire is to small, find it and see if it is getting hot when in use. I used a 12 volt lawnmorer battery on a little 14' boat I once had with a 42lb TM and it would run 5 to 6 hr.s , But I had to slow charge it all night.



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