Squareback alternator

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Squareback alternator

Postby coelcanth » Thu May 19, 2016 6:17 pm

my '69 D100 had been upgraded by a previous owner to the squareback (dual field) alternator and the solid state regulator..

lately it seems like it has not been charging so well at speeds under 3000rpm..

how do i test this setup to see if it's the alternator or the regulator ?
(i think the belt is tight enough)

as far as i can see,
there's no 'ground to test' spot labelled on the alternator
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Re: Squareback alternator

Postby wally426ci » Fri May 20, 2016 3:58 am

My square back runs 11.5 at idle and 13.5-14 at speed
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Re: Squareback alternator

Postby my5thmopar » Fri May 20, 2016 3:59 pm

Make sure that the regulator is clean and grounded well. 69 so it has the small rectangle mechanical? About 1.5x2.5 or so? If you have to replace it buy a good quality electronic. I bought one online that looks original but, has electronic guts. Craig
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Re: Squareback alternator

Postby coelcanth » Fri May 20, 2016 11:49 pm

No, the original mechanical regulator is gone,
An old made in USA solid state was added in the past.

Today I bought a new replacement probably chinese from Napa for $20..
To be determined if it does the trick or not
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Re: Squareback alternator

Postby coelcanth » Fri Jun 03, 2016 7:46 pm

well the new regulator seemed to help for a few days or so..

but then today it stopped charging altogether.

so i took off the alternator to get a closer look, and i could clearly see that one of the rectifier diodes was breaking off it's connection.
it had probably been slowly failing for quite a long time and was now completely detached.

so i rode down to the local alternator shop and they had a replacement negative rectifier and brushes on the shelf,
and i was able to install it right quick,
and now it's working just fine again

$10 fix
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Re: Squareback alternator

Postby jdavis » Sat Aug 27, 2016 12:12 am

Everything as far as the prevous posts. Now just go to a denso alternator,part # 13220 for 89 Durango with v6,from o'reillys, about 90 amps and you won't have any charge problems at idle. It is a dual field alternator. Just change the spade ends to rings, hook those to the field terminals, then go to Summit Racing and get their 80 amp wire and Maxi Fuse, hook that up to the battery terminal of your starter solonoid and to the large stud on your alt and your charging issues will be minimal. I've done it on my 65 barracuda. I'm doing it next on my 66 powerwagon w/318 poly. Just check out the electrical section(late alternator upgrade) There are pics and explanations.
Last edited by jdavis on Sat Sep 03, 2016 11:01 pm, edited 3 times in total.
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Re: Squareback alternator

Postby coelcanth » Tue Aug 30, 2016 4:37 pm

thanks,
I'm pretty happy so far with the $10 fix
my truck has been running and charging great with the vintage equipment.

I already ordered the alternator internal upgrade kit if i ever need more power or feel the urge to do a quick project.
I like keeping the old original style parts and i also appreciate the simple service procedures for the old parts
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