What size cables?
This is a very important question.
6v vehicles used no smaller than 2 gauge cable/ground-strap (smaller numbers are larger cables).
12 vehicles might have 4 gauge or even 6 gauge.
Many people with 6v vehicles use 0 gauge or 00 gauge cable/strap.They can be made-up at a welding supply shop; and, often Tractor Supply Co carries heavy gauge cables.
