24V Alternator Upgrade

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GreaseMonkeyJP

GreaseMonkeyJP

Joined
Jan 17, 2016
Threads
12
Messages
242
Location
Michigan
So it turns out that the 24V alternator on my 70 series is dead. (The brushes are worn out, and the rotor windings have a break)

I have considering rebuild or replacement options, but I am thinking that an upgrade from the current 30A output would be a good idea.

I found a 24V 60A Denso Alternator that I am thinking might be a good fit (with minor modifications), and for less than I can find an original one.
Part Number: 102211-0400
$_1.webp

It is listed as being used on John Deer engines.
It would need the pulley swaped, but outside of that looks like it might bolt right in.

Does anyone have experience with using this as a replacement, or other suggestions or upgrades.

Or any other good alternator upgrade proposals.
 
Is it a internal or external regulator Alt.
They say our cruisers are like farm tractors so it may just work ( is your 70 John Deere Green:lol:).
 
In my case the vacuum pump is not on the alternator so I don't have to worry about that feature.

Both are internally regulated, and have the same plug on the back, so no rewiring would be need. (I still need to double check the wiring to the battery and make sure that it could take 60 amps.)

I think that I even found one locally so hopefully I can pick it up Monday, and see if it works.
 
The engine that I am installing it on is a 1PZ, but I believe that the 1HZ uses the same alternator as the 1PZ so it should work on those vehicles as well.
 
Okay so I was able to get this installed with a few of modifications.

1. Pulley:
It is pretty obvious that the pulley that comes on the alternator is not the double V belt pulley that is on the they Toyota engine, but with a quick hit with the impact wrench you have the pulley from your old alternator. Unfortunately the shaft diameter is not the same so on the lathe it goes.
20160927_195430.webp

Unfortunately a thin washer is also needed to put the old pulley onto the new alternator.
2. Mounting Holes:
You may have also noticed that the location of the top hole is different from the one on the old alternator
20160927_190416.webp

(Note: This picture makes the size difference look much larger than it is)
This lead to two issues, first the distance between the two mounting hole is different so the upper bracket needs to be modified to allow it to rotate on the lower bolt (common design on other engines)
20160927_221954.webp

If you look closely you can see where I cut the bracket. With some new shorter belts this configuration will work, but I ended up making a new bracket to be able to use the original belts.

3. Wiring:
The output post on the new alternator is larger so you have to make some modifications. You should also increase the gauge of this wire, or add a second wire to handle the increased output. The plug on the back however is the same and you can just plug it it.
 
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