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High Output Alternator - new wiring?

Discussion in 'Ford Trucks' started by grizbait, Dec 29, 2008.

  1. grizbait

    grizbait Junior Member
    Messages: 18

    I've got the 1997 F250HD, 5.8L

    Currently has a 95 amp alternator - and it's time to upgrade to a 130-180amp, and a dual battery setup.

    Question is - if I can find an alternator to bolt up OK, is new wiring required to carry the extra amps? And if wiring parallel with the additional battery - (which I'll probably mount on the driver side, probably with a tray from a diesel of the same era) what gauge between them? Will 4 gauge work? Should I go 2 gauge?

    Also - if anyone has experience with this vehicle and knows of a compatible alternator that is stock for some other rig (maybe a diesel has one that will bolt up to the 5.8L?) I'm all ears...

  2. snowandgo

    snowandgo Senior Member
    Messages: 143

    I am sure they made gas ambulances, so you shouldn't have a problem finding an alternator. You could have a local rebuilder upgrade yours.

    130 amp should be OK on stock wiring, but 180 is a lot of juice.

    4 guage should be plenty between batteries, you are only carrying half the load of the plow or starter on those wires.