Stupid Ground Question

The only issue with lots go ground wires is when electronics start picking up noise from circular grounds.

Most of the stuff on our cars is not affected by this.

Running a ground from engine to firewall or trans case to chassis is not a bad idea. Ever seen a speedo cable that is melted? Guess what likely did that... probably turned the cable into a ground path.

Run a 10ga wire (min) or the braided straps if you have one.