1981 Jeep CJ7 CJ7 Starting and general power problems

Electrical problem
1981 Jeep CJ7 4 cyl Four Wheel Drive Manual unknow miles

hi, my neighbor has a 1981 Jeep CJ7 that he got from his neighbor, whom he got from a friend of his. The Jeep was alleged to be fine and running at the time the first guy owned it, and for some reason he decided that he was going to take it apart to re-do the wiring and paint it, etc. Then he got kicked out of the house, and it sat out in the weather for a while, and then sold to my neighbors neighbor. (Sorry for any confusion) but he didnt do a whole lot to it, so his wife made him sell it to my neighbor, who is a motorcycle mechanic, and we have started working on it after it has been sitting under a carport for about 3 years. The problem that we are having is that we dont seem to be getting power to the starter. We have the positive wire connected to the large post on the solenoid, but I dont think any others. The starter is new, so were a little lost. What wires go where on the solenoid and what do they look like? Because we thought there would be wires on both the small posts on the solenoid. (Occasionally the starter will click like its engaging but nothing else) three years ago the starter was operating, but now it wont. And since everything has been taken apart and disconnected, we have no way to tell if were getting power anywhere. If anything its intermittent. Could we have a bad ground? Are we missing wires on the solenoid? Any help would be great! And sorry its a lengthy problem.