The earthing you would have heard about would be the BIG 3. This means run upgraded cable from the alternator to battery, battery negative to engine, and battery negative to chassis.
Use 4-gauge for the alternator to battery positive, and for the two grounds use the same size cable as you have running to the boot.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)