How to Wire a Ford Solenoid | It Still Runs How to Wire a Ford Solenoid by Russell Wood . A Ford starter solenoid is one of the key components to the starting system of most older Ford vehicles. It's essentially a big relay, which provides power from the battery to the starter motor when the ignition key is turned over, starting the vehicle. Fender mounted starter solenoid wiring - is this as messed Mar 30, 2013This is how most ford gasser starters are wired, because they do not have a starter mounted solenoid just like your cummins starter. On my old f150 and my ranger, they are just like the picture you have. One solenoid on the fender. Question is this. Is this solenoid strong enough to handle the amperage a diesel starter demands.