Click,Click,Click!

If you were getting the voltages mentioned at the starter and solenoid, it surely must be "in" the starter. There are several things. Back in the day, I'd 'ha had that ***** apart. Mopars are a PITA because it's easy to break the internal solenoid wire which must be unsoldered. Bad solenoid contacts, bad brushes, bad armature, all gummed up, hard to tell. "Back in the day" I've had as many as 50 Mopar starters apart. Nowadays, I'd just "throw another at it" and believe me, I'm not a guy who, generally, "throws parts" at a car.