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PostPosted: March 17, 2018, 9:18 am 
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Joined: January 19, 2016, 10:16 am
Posts: 2
So I went rummaging around in a junk yard and found an alternator that will work with the Duratec 4 cylinders! It is off of an 07 Ford Ranger with a 3.0 Liter engine. Better yet it is a Ford 3G variety so it is super easy to wire up.

Here is a link with more info:
http://www.therangerstation.com/tech_library/alternator.shtml
My alternator is a 130 amp and it appears that the 95 amp is smaller and lighter although I am not sure of the year and fitment.

And some pics of it rigged up:

http://s36.photobucket.com/user/jayhorsley80/media/20170505_170259_zps82ka7r0d.jpg.html?sort=3&o=2

http://i36.photobucket.com/albums/e23/jayhorsley80/20180317_0905131_zpskni6af7c.jpg

http://s36.photobucket.com/user/jayhorsley80/media/20180317_0905061_zpsxjtjvdro.jpg.html?sort=3&o=1


And another link with wiring info:
https://www.ford-trucks.com/forums/attachment.php?attachmentid=60922&stc=1&d=1347274212


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PostPosted: March 18, 2018, 4:01 pm 
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Joined: April 26, 2008, 6:06 pm
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Location: Under the weather. (Seattle)
Great information...Thanks! :cheers:

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PostPosted: March 18, 2018, 7:36 pm 
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Joined: August 31, 2015, 2:24 pm
Posts: 88
Location: Delaware
Looks like what can be found on a mid 2000's mazda6 and NC miata as well. I think the mazda ia 100amp.


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PostPosted: March 19, 2018, 8:52 am 
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Joined: September 22, 2005, 8:12 am
Posts: 1445
Location: 4AGE in S.E. Michigan
Here's my 1/2 cent.
I really do not think you need such high amperage alternators in a locost. I installed a lighter wt, smaller amp alternator, [43-45amp]. I'm using an under drive alt pulley and under drive engine crank pulley, and even with an electric rad fan, it's not even near max'ing out the alternator when run other accessories. My 1/2 cent :D is you options should be based on cost and wt; then ease of fitment. You are probably going to carry that bigger alternator for the life of the car. The pick and pull price is not going to be a whole lot different for a smaller vs large alternator. I bet, is some of the Duratec,s came with a 60 amp alternator. Dave W


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PostPosted: March 19, 2018, 9:56 am 
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Joined: April 23, 2006, 8:26 pm
Posts: 5858
Location: SoCal
davew wrote:
Here's my 1/2 cent.
I really do not think you need such high amperage alternators in a locost. I installed a lighter wt, smaller amp alternator, [43-45amp]. I'm using an under drive alt pulley and under drive engine crank pulley, and even with an electric rad fan, it's not even near max'ing out the alternator when run other accessories.

This has to be assessed on a case by case basis. For a carbureted Locost with a mechanical fuel pump and fan, I agree that it's more than enough. For an EFI car, most likely not, especially if you have anything other than the bare minimum:

Cooling fan: 20-30 amps
Lights: 10 amps (assuming non-LED)
Water pump: 8-12A
Fuel pump: 15A
ECU/coils: 10A

Worse case it's night and stop-and-go traffic, so all the above may be on. With the alternator at idle, it isn't putting out anywhere near its advertised current.

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Last edited by KB58 on March 19, 2018, 3:21 pm, edited 3 times in total.

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PostPosted: March 19, 2018, 10:53 am 
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Joined: August 31, 2015, 2:24 pm
Posts: 88
Location: Delaware
For mine, the 100 amp was the smallest readily available bolt on that I could find at junk yard prices. There's always the raceline version but the price is a bit steep.


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PostPosted: March 21, 2018, 1:39 pm 
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Joined: January 19, 2016, 10:16 am
Posts: 2
I agree about the amperage being high,and overkill, but it bolts up and has an old school regulator. I wanna try out a 95 amp unit due to this smaller size and weight, but mine was 25 bucks and i didnt even have to pull it out of wreck.


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