2H and 3B alternator compatibility

[vanisle3b42]

Hey all, I'm looking to swap my toast externally regulated 24v 3B alternator for an internally regulated 2H alternator. I dont see why there would be fitment issues, but has anyone done this? Thanks!

 

[Tapage]

are you willing to re wire it .? clearly you are not gonna need the external regulator anymore .. ( assuming both are 24V ) and sure both will have the vacuum pump attached behind .. ( be sure both are in good working order, good moment to replace the oil o ring and carbon blades .. )

 

[too tall]

iirc you can add an internal regulator to a non internally regulated alternator fairly easily. If you take the two to A&B starters by the airport they can rebuild it to use an internal regulator. I have had them build/modify a few for me over the years. The ear mounting pattern changed slightly over the years and model to model 24/12, 2h/3b but a lot of parts are interchangeable.

 

[stevebradford]

Maybe im just confused by terminology but my 12v 3b's have the voltage regulator mounted on the side into the alternator. I would have called that an internally regulated alternator?
Maybe its a difference between 12v and 24v but I have at least one 24v kicking around and it's looks the same.

A

Edit: A little more info aparently some were externally regulated. In here a guy talked about gutting a 2h to swap the internals. 3b 3.4 4 cylinder diesel alternator

If the bearings are good there's not a lot to go wrong with these. voltage regulator, brushes or a diode none are big deal to replace or rebuild.

 

[vanisle3b42]

iirc you can add an internal regulator to a non internally regulated alternator fairly easily. If you take the two to A&B starters by the airport they can rebuild it to use an internal regulator. I have had them build/modify a few for me over the years. The ear mounting pattern changed slightly over the years and model to model 24/12, 2h/3b but a lot of parts are interchangeable.

Awesome! Thats great to know. The shop I work for has an account with Brian Roberts auto electric in Victoria so I'll give them a call to see if they can convert it.

The issue isn't with its rebuild-ability as this one was rebuilt about 10 years ago and never run on the truck.. But it developed issues somehow after sitting for 10 years haha.