Cylinder head ground stud location.
Inspect the OEM/Vehicle wiring harness for good connection and condition.
The cylinder head ground stud must have a wire ground to the battery negative (-) terminal. Tighten the cylinder head ground stud every oil change. Ground wires/straps should be combined at ground studs dedicated for ground use only. Inspect all of the engine grounds. All of the engine grounds should be tight and free of corrosion.
Perform the following procedures at least every other oil change, and more often as conditions require:
* Clean the cylinder head ground stud and strap terminals with a clean cloth.
* If the connections are corroded, clean with a solution of baking soda and water.
* Keep the cylinder head ground stud and the ground strap clean and coated with petroleum jelly or MPGM.