Grounding can be a real issue if it isn't done right. Anyone that has chased electrical problems know that you can lose a lot of hair when it is related to poor grounds. Ground problems seem to be prevalent in cars up in the "rust belt" too due to the salt on the road.
Therefore, I decided to make sure everything was properly grounded when wiring my car so hopefully I won't every have grounding issues. Here's some things I did to ensure positive grounding.
1) I put a jumper from the main battery cable where it attaches to the motor to the frame using a piece of #2 wire. Same wire Hurricane supplied for the main battery cables. Drilled a hole in the motor mount.
2) I put some jumpers between the dash support and the frame on each side. Used #6 wire. See picture.
3) I put grounding studs on the frame to provide ground points a places where there were a number of ground wires. These were just stainless 1/4" bolts welded to the frame with star washers and nylon locking nuts. See pictures. I put three on the 2"x2" support behind the dash. One in the center and two on the sides where the engine compartment supports tie in. I ran individual ground wires to the headlights, marker lights, horns, fan, etc. to make it easy to connect to them without having to splice the ground wires. A little extra wire but much easier to wire up.
4) I also put grounding studs in the trunk up against the cockpit for the rear lights, main electrical ground and battery. One on each side. Again, individual ground wires to the tail lights, license plate light, fuel tank sender, etc.
5) I tapped a hole for a 10-32 screw in the right rear quick jack mount to ground the fuel fill to eliminate static electricity. Removed the powder coating for a star washer.
My frame is powder coated. To ensure electrical contact for the dash support jumpers, I used a spot weld cutter to cut away the powder coating. Made a nice round spot for a star washer. Have to be careful as the spot weld cutter is designed to cut metal so just applied enough pressure to cut through the powder coating.
One of the pictures shows the 4 circuit fuse panel I added for the extra circuits like the fresh air fans, power outlet, etc. Nice compact unit that fit on the 2"x2" support behind the dash. Easy enough to get to the fuses.
Again, this is just the way I addressed grounding while installing the wiring. Other guys might have other ideas.
Russ