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Those two are different...you need the version in your SECOND picture. Note the different style holes/bosses for the brace attachment (which isn't used on either style).
The second pic is correct for a '69.
You probably already know this but others looking here may not.
Last edited by 70Post; January 19th, 2018 at 01:42 PM.
'70 only I believe. '71 CSM indicates internally regulad alt on Toros only....shows everything else to be the regular external voltage regulator type setup.
'70 only I believe. '71 CSM indicates internally regulad alt on Toros only....shows everything else to be the regular external voltage regulator type setup.
That's not correct. Note the parts book (Jan 1972 printing) for 1971 4400 series "42 amp w/ built in regulator". 1972 cars reverted to the 10DN external regulator, but 1971 still used the 10SI.
Wonder about the listings shown for '70......none of them show a 37A or 55A with the internal regulator yet we all know a plain-jane '70 442 and W30 came with the 37A (internal reg) and the AC, etc versions came with the 55A (internal reg).
That only shows a 42A w/internal reg for '70 442 or W30.
Maybe the "suggested" replacement alts were different??
Wonder about the listings shown for '70......none of them show a 37A or 55A with the internal regulator yet we all know a plain-jane '70 442 and W30 came with the 37A (internal reg) and the AC, etc versions came with the 55A (internal reg).
That only shows a 42A w/internal reg for '70 442 or W30.
Maybe the "suggested" replacement alts were different??
Likely this reflects superceded part numbers. The book shows the same 1100543 42 amp internal regulator for all 1969-70 442 and 1971 4400 cars. Also (interestingly) 4200 (Supremes) with 455 in 1970. Likely the 42 amp version superceded the 37 amp version. Obviously P/N 1100543 doesn't have the correct back housing for 1969, but this was about functionality and not authenticity for a BJ auction half a century later.
All 1969-70 442 and 1971 4400 show 1100544, which apparently replaces both 55 and 63 amp versions, again with the newer style back housing.
Finally, note that P/N 1846935 covers all 1963-1971 non-CAC applications (37-42 amp) EXCEPT the 1969-71 4400 series.
Bottom line, all 1969-71 442s did get the internal regulators.
I'll go with that....thanks for the thorough explanation Joe!
This is likely the same thing as where the 1971-72 dimpled front fenders replaced the flat 70 fenders in the parts book. Olds published a part number supercession list periodically.
This fella generally shows up at the Pate Swap meet every year. He has both versions of the finned back halves. All of his examples are nice, consequently they are not inexpensive.. $450 the last time I looked. I traded him an earlier NOS piece for a very nice later piece. Maybe you could buy the piece I had traded!. Good luck.
Joe is correct on the 1969-71 alternators all being internal.
All the numbers in the 1972 publication Joe posted are second production numbers, and would not be the original alternator number on a vehicle from the factory.
Joe is correct on the 1969-71 alternators all being internal.
All the numbers in the 1972 publication Joe posted are second production numbers, and would not be the original alternator number on a vehicle from the factory.
But - is my thinking correct if I say that the '71 alts did not have a finned back half and had 5 spoke open fronts instead of 6 spokes like the '69 and '70 front halves? (Some other GM cars used this smooth back/5 spoke front after 1970)
Hey Patton, you are correct. The 1971 alternators did not have the finned
"Diamond Back" nor were they open face like the 69-70 internally regulated models.
As far as the original poster, I may have a 1969 correct finned back. I will need to do some digging.
Thanks Devon.....that was my thinking but primarily based on similar alts used on some early '70's Buick Electras and Pontiac Firebirds and GTO's. Some of them have the 5 spoke front half and "smooth" back and I figured Delco probably did the same for Olds.
I am just referring to the open face alternators 1969-70.
It is also relatively easy to find non stamped open face alternators.
The finned (Diamond) backs are the hard part to find.
The finned (Diamond) backs are the hard part to find.
I stumbled over a correct 1970 back at Fall Carlisle. The vendor asked if I knew what it was (apparently he did). I said yes and expected the usual price. I couldn't get my wallet out fast enough when he said $25.
Those two are different...you need the version in your SECOND picture. Note the different style holes/bosses for the brace attachment (which isn't used on either style).
The second pic is correct for a '69.
You probably already know this but others looking here may not.
I deleted incorroct pic.
Will consider #1100853 Alternator in any condition.
The finned back halves, both the '69 version and '70 version, are fairly rare.
Now you would think they'd be easier to find since they did come on 442s as well as W30's (and I assume SX cars in '70 as well) BUT the back halves have also been grabbed by Chevy folks to use on their setups. Some Chevy performance cars from the same era used the open face alternators (with finned back halves) so a Chevy nut with a correct stamped front half can use the same back half we use. Lots of cars/folks fighting over a limited supply I guess.
These things aren't typically priced cheap unless the seller is in a "philanthropic" mood or doesn't know how rare they are.
You may be able to do better, price-wise, than the $450 or so you'd pay the guy in Oklahoma (Funkwagon posted a pic of his business card) for a correct back half BUT he probably has inventory and your search would be finished. Considering that the internals are VERY common and cheap and that complete alts sell for $700 - 1300 or more, you can see where a price for one half of the rare case setup would run into the $400+ range.
Keep looking here if you have some patience and maybe someone will come up with a spare. If you want it NOW....call the guy in Oklahoma.
just my .02 - how many people look at the back of the alternator. If you have the front part I'm not so sure I'd worry about getting the back. Its the open-face front that really makes it unique and obvious when you open the hood.
Agree with Funkwagon455 (aka - the artist formerly known as Heath ) - as I said in a thread over in the Tech Question section - "if you're gonna eat at the buffet, fill up your plate".
Watch people closely at Olds shows now. Used to be the owner would pop the hood and observers would see the front of the alt and notice the open face. Now they do that but pretty soon move over to the side of the car and angle in for a look at the back half.
One of many cool details and it's nice to have the complete package/look when it comes to these unique alts.
100% agree with Funkwagon455 and 70Post. A numbers matching motor will not and does not have the same conviction, if the ancillary components surrounding it are generic.
I agree but for $400 I''d say take your time and see what pops up. Both my W30s have the correct (possibly even original) alternators, back, front, numbered and date coded. I'm just offering up an option. Its getting to very expensive just to keep these cars running well, let alone collect all the correct parts.
January 19th, 2018, 01:28 PM
. Good luck.
) - as I said in a thread over in the Tech Question section - "if you're gonna eat at the buffet, fill up your plate".
