Yes, Delcos are cheap and that is their biggest asset. Cheap and easy to work on. They are fine for limited use tractors unless size is an issue.
Deere tried using Delcos OEM for awhile. But even with the brush/dust kits added, they had short lives. Also lost their diode-trios pretty easy when tractors got "boost" charged. That's why Deere tends to use Bosch, Motorola, or Denso sealed units.
The Hitachis are interally regulated, just like the Delcos. They even have the same regulator bypass port that you can stick a nail into to make it bypass the reg and run max charge (for testing).
I don't know off hand what specific model Hitachis I've been using. Most are the 5" to 5.5" diameter LR series, probably LR-150s or LR-170s. I've been driving Subaru Loyales for years - and have scrapped many due to rust. Thus I have many extras laying around. 1985 to 1992 Loyales and GL series all use them. Subaru Justys use smaller versions that only measure 4.5" diameter. Many Nissans, Isuzus, etc. also use the same.
I'm in the rust and snow belt in NY, so junkyard alternators from Subarus were just as cheap as Delcos. But now, not many older cars in the local junkyards anymore.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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