Putting larger and/or additional cabling ANYWHERE in a DC system allows easier transfer of the electricity through the system.
Adding or upgrading the alternator charge cable lessens the resistance that the alternator has to push the power through, thereby reducing strain on the alternator and thus on the engine.
I've got 4ga waiting to be ran from the alt to the battery. 1/0ga waiting for a crimper to ground the piss out of the engine and battery.
Anything to help the [electrical] power flow from point to point helps the engine, period.
The alternator doesn't pull any power, it supplies it, pyaaw.
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