Dakota 5.9 odd ground issue starter relay clicks but won't crank.

#6 IIRC but could be #4.

Factory cable from batt to PS bracket (original location, but now lower bolt instead of upper).

#6 or 4 aftermarket battery cable from body lug to fuse box.

I don't have a cable from the body lug to the block or head any more as that's the one that failed initially.
It was MUCH thinner gauge.