A question for all you electrical Gurus out there. In the July American Iron the was a Tech Tip about running an additional negative lead off the battery terminal to the starter, essentially another Ground. The reason given in the Tech Tip is it helps start&nbsp\\;cranky motors. I presume it allows the current to flow more efficiently? Anyone care to share the electrical theory on this 'trick'?&nbsp\\;Do you land it on the existing negative terminal lug on the Starter?&nbsp\\;

 

The ground path for the starter is through the aluminum case (not to mention rubber mounts) which is probably minimal. Starters pulls lots of amps so a good size copper cable addition should improve the current flow for a large build engine that really taxes the starter.
GPM
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"...should improve the current flow for a large build engine..."
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No advantage for a stock mill, correct?
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Correct
GPM
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Don't know about your bikes but I suggest you take a closer look at the ground cables. The larger cable IS attached to the engine and a smaller one runs to the frame.

 

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My point was that you do not need it with a stock 1.2 kv starter on a stock engine. Put a 2.0kv starter on a mega build, hard start engine &amp\\; you'll get the benefit of it.
GPM
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one thing i have learned after 25 years of working on army helicopters, you cannot have too many grounds.