I put new terminals on the cables. I have a crimping tool that does a nice job. This tractor sat a long time before I got it. The starter is probably corroded inside. One thing I've experienced over the years is a machine that has been sitting any length of time, the starter will probably give you trouble. I have bought quite a few surplus military vehicles in my life, and most all were very low miles, sometimes just a couple thousand. If I didn't sell it quick, it would need a starter because military vehicles sit a lot, same goes for generators, and alternators, but starters were at the top of the list. I can't rule out a cable 100% but neither one has a bad connection which usually shows up under a load.