2004 Ranger 4.0 4x4. At times, when I turn the key to the crank position I get a no crank. The dash does light up as expected. If I try mutiple times, going from "run" to "crank" the engine will crank. I replaced the underhood starter relay and sprayed contact cleaner into the key slot. Now I'm thinking either ignition switch, clutch lock-out switch, starter solenoid. Anyone else ever had this problem. Is there a part prone to failure? Forgot to mention. 238,000 miles. What's my next best shot? Thanks for any help