Is this the correct alternator for my car?

[roger440]

As per title, is this the correct alternator for my 69 RT/SE with A/C.

I dont want to restore it unless it is correct.

[Nacho-RT74]

that's simply a housing number, not necesarilly a complete assembly service  part number. From earliers/mids 60s used same housings ( stated by the first two numbers 20xxxxx )

[roger440]

Ahh, right. Didn't know that, thanks.

Got a pic of the back if that helps. Is there a part number i should be looking for?

[UFO]

Number is stamped on the outside edge,in the area near the positive post.

[John_Kunkel]

The correct alternator assembly number for a '69 B body with 440 and A/C is 2875724, this has the 3" double pulley.

[roger440]

Thanks guys. Didn't see the number there as it had some sort of paper sticker over it. Sadly the part number is 3656131 

Looks like i dont need to restore it! Just need to find another one. Dont suppose mine is a rare hemi only one is it???

[TylerCharger69]

hmmmm.....My 69 383 A/C when i first got it had the original stuff on it but it was a single field alternator instead of a dual one.  Prolly brings up another question.....

[Nacho-RT74]

that looks more a 70 alternator... dual field but still round back alt. NOT A COMMON ALT.

I think also used on lates 69s C bodies

[Ghoste]

Don't have an application but that part number range would put it around 1972 wouldn't it?

[maxwellwedge]

Actually, The one terminal with a wire on it says field - I bet the other says ground - some re-builder put the incorrect tang on the ground.

[Nacho-RT74]

no, thats simply a modified back housing at casting. They apparently didn't take care about those field labels on to casting. On single field alts, the blank space with the GROUND label was filled with a grounded, directly fit in to housing brush.

and yes Ghoste, that Pn doesn't soudn correct to me for a 69/70 assembly, it sits more in to 73 or 74 year. 69s and 70s are more in 29xxxxx or 30xxxxx. For a 69 alt a 28xxxxx will be correct to me, being used same 68 alternator

[roger440]

Thanks guys. Anyone got the right one in therir shed?

[Nacho-RT74]

I will tell you a secret. If you get the right back housing and its attached field, YOU WILL GET YOUR RIGHT ALT LOL... I mean if you want a correct year car in everything.

but just in case, you have there the alt for electronic voltage regulator, without needing anything else than one extra wire and the regulator with pigtail

[Nacho-RT74]

this is the rear view of the right dated alt, or just rear housing you need to build a correct dated 69 alt

[roger440]

I will tell you a secret. If you get the right back housing and its attached field, YOU WILL GET YOUR RIGHT ALT LOL... I mean if you want a correct year car in everything.

but just in case, you have there the alt for electronic voltage regulator, without needing anything else than one extra wire and the regulator with pigtail

Ahhh, shame ive got a wiring harness for the correct style  

By back housing im not sure what you mean. Do you mean the part with the number stamped in it? Or does that give me a one wire alternator with the correct number?

All i really want is the correct alternator with a seperate voltage reg. Year correct is important, though i think i may be taking it a bit far!

[roger440]

Ahh, just seen pic. Know what you mean by back housing.

[Nacho-RT74]

ok... on that pic you can tell the brush difference, without prong and/or isolator, directly attached to chassis at opposite side of the one you have.

the alt you have, dual field roundback could it be interesting for some 70 owner searching for the same you are on, since is quite rare... one year production ( plus replacements with same specs around )

[John_Kunkel]

The roundback dual field unit isn't a one year only, the squareback wasn't introduced until '72.

Any Mopar alternator can be converted from single field to dual field and vice versa with a simple brush and brush holder change, no need to disassemble.

[maxwellwedge]

The roundback dual field unit isn't a one year only, the squareback wasn't introduced until '72.

Any Mopar alternator can be converted from single field to dual field and vice versa with a simple brush and brush holder change, no need to disassemble.

JK is 100% correct - And I still stand by my earlier post - even though the part number Roger has stamped on his pad is wrong for his application the casting is correct. Nacho - the logo casting in your pic is really early to mid 60's.

[Nacho-RT74]

I know about the alt conversion on any of the ways, but he is simply searching for the correct one, not looking for conversions.

well... is not one year, is two years alternator , still low production unit compaired with the rest

yes I know the casting is correct... is correct for all alternators before that year since they used the same housings.

also I know the one I posted it could be mid years but the look of the alt he wants is that one

[roger440]

The roundback dual field unit isn't a one year only, the squareback wasn't introduced until '72.

Any Mopar alternator can be converted from single field to dual field and vice versa with a simple brush and brush holder change, no need to disassemble.

JK is 100% correct - And I still stand by my earlier post - even though the part number Roger has stamped on his pad is wrong for his application the casting is correct. Nacho - the logo casting in your pic is really early to mid 60's.

So, what your saying is visually its identical? What about this one wire v regulator deal. Mine would have a regulator yes? Whats the deal with the one i have. What is in it?

I understand the later ones have an internal reg, but not sure i know how that translates on the wiring side.

[Nacho-RT74]

how much later ones ?, not the 70s or 80s at least.

yes what I'm saying is vissually identical.

your one was the firts attemp on dual field alts being still on roundbacks. As stated 70/71 years only. As JK told on 72 they redesigned to alt to a squared back alts, with diff diodes disposition and attaching.

My thoughts are that you have in fact a 71 alt. First attemps of this design I have seen mostly sure 70s alts and some 69s C bodies, have dual disposition to set it up like a dual or single field. Maybe also designed for replacement to set it up on any car you got. Without PN references, those are simply my thoughts

just like this
Red circled seted for dual field, note grounded brush location without use ( your one is like this but without the circled grounded brush provision, just a blank space )
Yellow circle setted for single field, note isolated brush location without use ( Same as the one I posted earlier to sow you the one you have to look at, but without the circled provision to the isolated brush )

Both same alt

[Nacho-RT74]

the on 72 this was the new design ( pulley can be diff ):



made in same rates than earliers...

by I think 75/77 years was rededesigned again, giving 78 amps output with a wider stator. Housings were also changed, covering completelly the stator center. Brush prongs got a hole to screw provision on these. One of the isolators is totally diff than earliers



( taking Beck/Arnley alt pics as reference, Mopar units could have MINOR differences, but basically these looks the same )

[roger440]

how much later ones ?, not the 70s or 80s at least.

yes what I'm saying is vissually identical.

your one was the firts attemp on dual field alts being still on roundbacks. As stated 70/71 years only. On 72 they redesigned to alt to a squared back alts, with diff diodes disposition.

My thoughts are that you have in fact a 71 alt. First attemps of this design mostly sure 70s alts and some 69s C bodies, have dual disposition to set it up like a dual or single field. Maybe also designed for replacement to set it up on any car you got. Without PN references, those are simply my thoughts

just like this
Red circled seted for dual field, note grounded brush location without use ( your one is like this but without the circled grounded brush provision, just a blank space )
Yellow circle setted for single field, note isolated brush location without use ( Same as the one I posted earlier, but without the circled provision to the isolated brush )

Both same alt

Cool, thanks. I think i get it. Ill have a look at it tommorow (too cold and too much snow right now) and try to understand it.