Wondering how to check see if my ground and postive cables are doing the job. I searched found so many posts and conflicting info any solid ideas?

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2004 Infiniti G35 3.5L 6mt Coupe 73K miles 25.6mpg ytd
2001 Green Audi TT 225 AWD Roadster 71K 6sp 30.9mpg >>STOLEN<<
1982 300D Turbo 231K 120hp? 28.1mpg YTD

1.Clean tight connections.
2.Measure the resistance of each cable, point to point,while connected...
there is a formula to figure out the resistance loss base on length and diameter.
3.Get really crazy and "Meg" them out (Disconnected form vehicle).

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'84 300SD sold
124.128