P71 Alternator swap on a 3rd gen?

Discussion in 'Electrical' started by briandye, Jun 27, 2018.

  1. briandye

    briandye Full Access Members

    Age:
    26
    Posts:
    72
    Likes Received:
    8
    Joined:
    Feb 27, 2018
    Location:
    Michigan
    I have a 2008 Limited, non-EL. Been looking to upgrade the alternator, because with the stock setup, in the morning or night, having headlights, AC or heat (as well as rear) and my blinkers going, obviously is a huge draw on the system. I plan on overhauling the stereo soon (4 channel amp for the doors, plus sub/sub amp), as well as electric fan swap and some other electronic goodies.

    I was comparing the Crown Vic alts to ours, and they look nearly identical, but the P71 has the smaller “underdrive” clutched pulley, which will give more amps at idle as well. Those are rated at 200a, but tested up to 240. That would be more than enough for me.

    Has anyone swapped one? I have a stock Vic alt at home, from when I switched my stock to a P71, so I can test fitment, but I’m curious about actual output possibilities.
     
  2. Adieu

    Adieu Full Access Members

    Age:
    32
    Posts:
    2,100
    Likes Received:
    340
    Joined:
    Dec 22, 2016
    Location:
    SoCal
    Ebay shows 250 and 300 amp versions, supposedly, speced for 5.4l Expeditions, again supposedly
     
  3. briandye

    briandye Full Access Members

    Age:
    26
    Posts:
    72
    Likes Received:
    8
    Joined:
    Feb 27, 2018
    Location:
    Michigan
    Yeah, but those are no names, typically never last, common to burst into flames, and those ratings are typically “up to” 300a at some ridiculous 5-6k RPM range, less than stock at idle.
     

Share This Page