At DC or low frequency AC, current flows throughout the conductor, so actually you have more surface area (for a given cable diameter) with solid wire than stranded wire for a conduction path. As frequency increases, and we are talking about up in the HF, VHF, UHF, and beyond, current flows on the surface...path of least of resistance. That's why "Waveguides" are effective for microwave frequencies; very low loss, high surface area, signal totally encapsulated.
I had a 4230 with batteries on either side and daisy chained together for 24V, mother deere OEM. Slow starter in the winter. Got tired of that so I made some changes.
I mounted new 12v, size 31 (⅜" studded size 27s) OTR truck batteries, very reasonably priced as the OTR dealer bought batteries by the pallet, 960 CCA each on either side as was the OEM positioning and ran parallel 2/0 stranded wire across connecting the batteries in parallel.....which the OEM truck dealer made up for me at a reasonable price; same wire used on OTR trucks.
From the battery adjacent to the starter, I ran (as short as possible) the + 2/0 to the solenoid input and the - 2/0 mounted under a starter bolt, with the connection nice and shiny and tight such that the lead was in contact with the mounting flange of the starter. This made the lowest conduction path for the least starting current resistance.
I don't need to tell you what a difference it made. All I had to do was be near the tractor and just "think" about starting it and she lit right off on her own......well not exactly, but you get the idea. Grin!
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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