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Old 08-27-2016, 11:12 PM   #1
chewychevy67
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Join Date: Jan 2010
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Posts: 5,438
Does anyone know anything about 20dn alternators?

I have 2 different 20dn alternators. Both have the same plug on the back side our trucks use. There are 2 series of them. The 20dn series 150 # 1117765 and is off a 67 I had and the other is a 20dn series 250 #1117756. Both would inter change and look the same except for the back side. What is the difference between the series and which is better? Any information out there?
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