It's easier on the pick up truck.
I installed mine in ten minutes. Look for the red/orange plug protective cap from the underside front of the car toward the right rear of the block. Look hard, you can barely see it as it is behind the components. Now comes the hard part. You need long thin arms. You have to lay across the engine (not running of course) drop the cord down by the right firewall area, FEEL for what you saw from underneath, pop off the protective red/orange cap and press the end of the cord on with your fingertips. Done. Done without dismantling anything. Sometimes the cords are on eBay for fifty or less.
You did that on Jeep Grand Cherokee ecodiesel or ram?