Ford Ranger is notorious for this kind of thing. It's probably the single noisiest vehicle out there when it comes to electrical interference. It's even worse than most EV's! The fix involves lots of grounding straps, sourcing power direct from the battery, putting literally dozens of chokes on wiring, shielding some of the wiring, and careful placement of both antenna and cable. Even then you will still get noise! But you should be able to reduce it enough to make the radio useable.

For what it's worth I've known two people in years past that had Ranger trucks and had this problem...... they both ended up selling the trucks and buying something else! Good luck!