I here a lot of people talking about the connection to grounds on jeeps, where are they all located? The only one I can find is the one behind the engine connecting to the fire wall. Thanks

 

Primary Grounds:
- Follow the battery negative cable to the engine block - this is the primary ground for the engine. Clean the lug, use fresh hardware PRN. (If the stud backs out, get a 3/8"-16x3/4" screw and some flat washers to replace it. You'll be fine.)

- The braided strap from the firewall to the engine is the other one, and the primary ground for the chassis. Since the ECU is mounted in the chassis, a good chassis ground is vital to proper function! The engine end may be relocated to the rearmost screw retaining the fuel rail for your convenience - you won't have any trouble doing it that way. I've done it on several vehicles.

As part of a number of my kits, I offer an optional ground that may be run direction from the battery to the chassis. This will often clean up issues you didn't know you had! You may also construct a short ground strap yourself - use minimum 8AWG wire, seal well, and clean the contact patch with the chassis down to bare metal (about the size of a postage stamp,) and apply corrosion inhibitor on assembly (like Gardner-Bender Ox-Gard. Make sure it's electrical corrosion inhibitor - and not something else that won't do the job as well and will cause you trouble...)