Alternator for sure. Just replace it and make sure you charge the batteries before running the truck with the new alternator. If not it could cause damage with too much time charging from a dead state.
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F250 Reg Cab - 1,172 HP / DJ# / 11.56 Fuel Only / 10.94 Nitrous / Dyno Run 10-2009
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Wide Open Performance - Engine, Chassis Build
Swamps Diesel Performance - Injectors & IDM
Gearhead Automotive Performance - Stage II Cam
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