Not Ranked
Side with DV on this one. I don't trust frame grounds, and tend to add redundancy. It'll start and run just fine initially, but as vibration and corrosion sets in, sooner or later you'll have problems. Steel also has more resistance than copper wire so some current loss will occur. Run a ground wire to the engine as a primary ground. Then run a ground strap from the engine to the frame.
I crimp, solder, grease, and shrink wrap all exterior electrical connections.
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