Compression Ignition Addict
Join Date: Dec 2007
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Remember though, it doesn't matter what the maximum output the Alt is capable of, it's what the system "needs" that's going to determine how many amps it Alt will be producing.
300A doesn't mean it's putting that out all the time...
With just the engine running the draw from the electrical system is pretty low and, because we have dual batteries to support the Glow Plug system while cranking over the, high compression motor, there's a tremendous reserve available. Charging those batteries back up normally wouldn't require anything like 300Amps.
When the GPs are ON, there's close to a 200A load, add at least that much more for the starter, but the Alternator isn't activated during those periods and those high loads are only temporary.
Lights, amps, and other aftermarket accessories are the biggest reason to upgrade the Alt, but stock I doubt you'd ever ask the new one to put out anywhere near the 300A. I wouldn't worry about it...