Posted by John T on January 27, 2011 at 07:18:32 from (71.54.160.251):
In Reply to: Battery cable size posted by Bob Day on January 27, 2011 at 04:27:55:
On most old 6 volt tractor applications (Especially for larger such as Farmall M or John Deere A etc) I recommend AT LEAST 0 WHILE OO IS EVEN BETTER...........
When you only have 6.3 volts to begin with and heavy current draw can reduce battery voltage even further YOU CANT AFFORD TO BE DROPPING TOO MANY VOLTS ACROSS THE CABLE, the starter motor needs all it can get and the heat energy (I squared R losses) wasted and dissipATED ACROSS A TOO SMALL CABLE does NOT help matters.
Sure, 1 or 2 gauge will work and not do as much harm when its warm BUT let the temp drop to zero and the battery efficiency drops plus the engine is hard to crank OUCH you will be wishing you had 0 or 00 gauge cables
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