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Farmall & IHC Tractors Discussion Board |
Re: Batttery Cable Hookup
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Posted by Bob M on May 14, 2007 at 10:18:53 from (151.190.254.108):
In Reply to: Re: Batttery Cable Hookup posted by John T on May 14, 2007 at 09:32:33:
John T - I kinda stumbled into that smaller cable thing. After I first converted my Super M to 12 volts (and retained the original 1/0 cables) when the starter engaged the mechanical shock was so severe you could feel it even in the seat. After a couple seasons of getting slammed like that the bendix blew apart and had to be replaced. On the advice of the guy at the starter shop I substituted a lighter #4 for the #1/0 hot cable when reinstalled the starter. Discovered this noticably softened the initial shock of starter engagement, yet still permitted the starter to crank the engine extremely fast. My theory: The slight added resistance of the smaller cable reduces the initial starter inrush (locked rotor) current and initial armature acceleration. This then reduces the mechanical shock of bendix engagement. However once the starter gets spun up, the faster armature RPM results in higher back EMF which causes the starter to draw LESS current than it does on 6 volts. (Higher armature RPM = greater back EMF = less running current). At this point the higher resistance of the #4 cable becomes essentially inconsequential. (Disclaimer: I could be all wrong. This is simply how I rationalized what I've observed and stuff I remember from EE courses taken 35+ years ago...) ---- "maybe you better be there if I get stuck??" Come on John T!!! Unless you "get stuck" in a muddy parking lot at the Expo and need a tow, I doubt there's much I'll be able to help YOU out with... Heck - I can barely SPELL "Wico", let alone answer questions about 'em!
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