We installed the electric jack this morning. Remove the three bolts holding the manual jack in place and lift it out. Place the electric jack into the same hole and reinstall the three bolts. Run the red wire to the + battery post and thats it. Being a 3500# unit, it lifted the front of the trailer and rear of the truck high enough I could set the WDH bars by hand. It goes without saying that to change the jack you must be hooked to your T/V or use jack stands to hold up the front of the trailer when you remove the manual jack.