Only question that needs to be asked is........."What color is the car/truck?"
If the answer is not RED then you found the problem
Simple solution, paint it RED, then it will run fine....................forever
Now that's science
All Rangers are RED, any other color is just primed waiting for the final coat of RED
So if yours is not RED then it wasn't finished at the factory, try to get your money back
or paint it RED yourself
And its why Rangers last longer, its because they were all build like a RED vehicle, but without that final coat you can have break downs
Its a Starter "Relay", not solenoid, a starter solenoid is on the starter motor it moves the starter gear in and out, thats what solenoids do they MOVE things, a Relay activates electrical circuits
They are Core Plugs, not Freeze Plugs