Engine Ground

[Blas]

You can easily add a ground cable from a bolt on your starter to a good chassis ground. I agree with cleaning the paint and using a star washer to insure a good connection. As for wire size, check the cable size on your positive lead (red) on the battery and go maybe one or two cable sizes smaller because the run is so short. Use a black cable too not red. I would guess you have a ground on the trans somewhere. Worst case would be grounding thru the cooling system..A local forklift battery shop can usually make a great cable too. Try a welding shop, welding cable is nice and flexable. Determine a length and the orientation of the hoops before you purchase. You can't twist a heavy short cable too much when installing. Provide slack or a loop to allow for engine movement too...