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    1. · Registered
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      46,181 Posts
      Well I am assuming this answers my question on the alternator?

      With the engine on the DC fluctuates between 14.8 up to 16V
      AC fluctuates between .1 and .5V


      I suppose the next question is, if I were going to replace the alternator, which one? I would want to go with PowerMaster for sure but there are so many to choose from! If I understand correctly, this is a 3G alternator setup?
      I'm not concerned with the marginal AC voltage as much as the high DC voltage. I wouldn't want to see DC voltage much exceed 14.7v at the battery terminals at 1,500 rpm or so. You might want to check out a different brand VR. If you decide to go with an alternator swap, I'd go with a 93-95 Aerostar 95A 3G unit with internal regulator... pretty much a direct bolt-in with some minor wiring changes.


      and

       
    2. · Premium Member
      1968 Ford Mustang Coupe | 302 | E-Style
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      416 Posts
      Discussion Starter · #20 ·
      I'm not concerned with the marginal AC voltage as much as the high DC voltage. I wouldn't want to see DC voltage much exceed 14.7v at the battery terminals at 1,500 rpm or so. You might want to check out a different brand VR. If you decide to go with an alternator swap, I'd go with a 93-95 Aerostar 95A 3G unit with internal regulator... pretty much a direct bolt-in with some minor wiring changes.


      and

      I did start the engine seconds before taking this video so it was nowhere near warm but yeah pretty wild changes there. Going to run to UPS and will measure again once I return to see if there is any changes when warm.

      I am all good with wiring, that's my speciality, you wouldn't recommend the Powermaster units? I've read good things about them, just curious. The VR is this one from NPD - VOLTAGE REGULATOR, ALTERNATOR - #10316-2A - National Parts Depot
       
    1. · Registered
      1971 302 C4 auto convertible, Grabber Blue/white/white
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      987 Posts
      Simple diagram, red and yellow can share post on back of Alt, gray/white plugs on back of Alt, red goes via fuse to starter solenoid and then BAT, ggreen, might have red stripe goes to ignition. Optional ground cable….only 2 wires need to leave Alt and run to inner fender…google ASI a plug for the connector…



       
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