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simply taking your foot off the gas is not effective for engine braking
you have to down shift or provide some form of extra resistance
otherwise your basically just coasting in gear
getting that extra resistance by cooling your cab or charging your battery
is simply smarter and its a little dangerous to engine brake without a brake light
even if your stopped in traffic its better to use your idling engine for something than nothing.
hooking your alternator or AC pump to the brake light allows for a convenient way to harness otherwise wasted energy without burning up your starter
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