How to Wire a Ford Solenoid | It Still Runs How to Wire a Ford Solenoid by Russell Wood . Wiring them from scratch isn't difficult either, but it does take a little bit of time. Step 1. Run a section of 4-gauge cable from the positive terminal on the battery to the "A" post on the side of the solenoid. Then run a section of 4-gauge cable from the "A" post on the side of the solenoid 1977 F250 starter solenoid wiring - Ford F150 Forum Dec 22, 2014I have a wiring problem. My truck is a 1977 Ford F250. It has been completely disassembled and rebuilt. Right now I have the engine back in and the wiring put back in. One problem, There is one wire that was originally a fusible link wire. I had this marked as going to the starter solenoid.