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The stock 2004 6.0L alternator is 115 amp. You can find 140 amp alternators fairly easily, and with a little searching I was able to find alternators as high as 200 amp.
If you do want to go with a higher output alternator, the most you might need to do is replace the current alternator output wire to one that is larger.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
