My starter failed and I replaced it. I have a '93 F250 4x4 diesel. This starter worked fine for a while and then began to jam when I turned the key. It got worse and worse and finally failed. When replacing it I discovered the positive lead on one of my two batteries was very loose. I just replaced that starter and this one has worked fine for a week and now it's starting to jam. I just turn off the key and on again and it starts, but it's getting harder and harder to do that with more off and on's.
Question: Could this have anything to do with the solenoid mounted near the battery???
Thanks, RO