I picked up a 1988 Ford F150 6cy and the starter solenoid missing

I have provided an image that will assist you and it will connect like so;

1. Connection 1 should have the Pos. (+) battery cable and all of the wires with the large eyelet connectors from the wiring harness connected to it, except for the large cable that runs down to the starter.

2. Connection 2 should only have the large cable going down to the starter connected to it, and there should be no other wire connected there.

3. Connection 3 is the "S" terminal on the starter solenoid, and it is the wire with the small push on connector that is hot only when the key is in the "start" position, usually it is a red wire with a blue stripe, but that is not always the case.

4. Connection 4 is the "I" connection on the starter solenoid and it feeds current back into the ignition, and it is not used on a lot of vehicles after 1981, but if your vehicle has it it will be a small push on connector that will not have any power from it at all, and it will usually be a black wire with a white stripe, but that is not always so.

Is the solinoid built in with the starter if so the heavy {thick }one comes from battery,big terminals,other heavy one onto motor,the thin one is from the igmition switch which enerjizes the solinoid coil to operate it.the same with a sepperate one