Dual Negative Leads Off the Battery

ScooterJammer · #1 06-16-2008, 11:54 AM

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\\;

grandpawmoses · #2 06-16-2008, 12:40 PM

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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ScooterJammer · #3 06-16-2008, 12:47 PM

"...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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grandpawmoses · #4 06-16-2008, 01:06 PM

Quote:

ORIGINAL: ScooterJammer

"...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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kruzin · #5 06-16-2008, 05:27 PM

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.

grandpawmoses · #6 06-17-2008, 06:23 AM

Quote:

ORIGINAL: kruzin

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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huffhuff · #7 06-17-2008, 08:00 AM

one thing i have learned after 25 years of working on army helicopters, you cannot have too many grounds.