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Discussion Starter · #1 ·
My 4bt from a 1988 Ford 3/4 ton bread truck is a CPL# 858. It has the Ford charging system on it (autolight?). It has been rebuilt and I think the case was cleaned in a tumbler type cleaner and it must have wore off the markings. I can just barely make out the field and stater markings. I have removed the alt and looked it over real close and still can not find the amp rating on it anywhere. the case is 6.5 in in dia. and about 4 in deep. I suspect it is around 100 amp. How common is it and does any other Ford product use it?
 

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It sounds like you have a "1G" large case Ford alternator. These are typically externally regulated and produce 75 to 85 amps. A Ford "3G" alternator would be a direct bolt in, provide you with internal regulator and "1" wire connection. The "3G" can be built for diesel rpms producing 85 to 200 amps.
 

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Discussion Starter · #3 ·
Yes, I forgot to add that mine is externally regulated. The 3G sounds like a good idea. What were these used on?
 
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