Grounds you need then so lets use them Ground the battery to the frame and the frame to the body You can't have too many or too big of grounds On glass cars with out steel inner structure use a 10 gauge wire from frame (bung) to under dash area (ground pad or bung) Plan ahead for your ground locations Every electrical component needs a good ground Ground engine block to frame: use a weld bung on frame, on right side on most projects, use a engine boss to bolt the ground to (be sure the grounds are to bare metal only) Always clean off all paint, powder coat, etc off all ground bungs and engine grounds Use silicone spray (or similar) on bare metal ground locations to prevent rust and corrosion It's best not to use engine mount or Trans mount bolts (the ground path can't easily be verified) Use black wires for grounds only: it will save confusion later