Sirrotica,
I am quoting from real world experience, started when I rebuilt my first engine in 1965.......& am still doing it today.
Anybody who doesn't read books to enhance their knowledge base is a fool.
I studied electirical engineering for a total of 6 yrears at a technical college.
Getting back to the frame issue.
Using the frame for grd return is a good idea, has lower resistance PROVIDED the cable connections at each end are clean & have good surface area contact.
Here is something else not mentioned. Starter cable is made of stranded copper wire. Many strands. There is an air gap between each strand. I couldn't find any battery cable for this comparison, so I used domestic power cable. It was stranded, 7 strands; I stripped the insulation off & measured the od with a micrometer: 0.102". Measured the OD of a strand, calculated the area & multiplied by 7. Combined area came to 0.073". A big drop from 102. The same principle applies to batt cable. you might strip the insulation & measure it at 5/16". But it would have the SAME resistrance as a piece of solid copper of a much smaller OD. Steel frame is solid, no air gaps, whsat you see is what you get....
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