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2003 Ford E-350 V8 5.4L High Output Alternator JS Alternators This is a direct fitFitment: This is a direct fit high output alternator for the 2003 Ford E 350 5. 4L. Being a direct fit, this alternator fits directly into your stock alternator location. Plug: This high output alternator comes with a separate adaptor plug. One side will plug directly into the aftermarket high output alternator, and the other side will plug into the factory plug. NOTE: If you require charging at a certain voltage setpoint, we offer a selection of