Which one is the AC relay?
#1
Which one is the AC relay?
I've been doing some research on my '72 Supreme just for general knowledge, and I'm trying to locate the AC relay. The ASM shows two relays, but I'm not sure about what I'm looking at.
Any help would be appreciated 😀
Any help would be appreciated 😀
#2
From the PIM (yeah, this is 1971; the 72 is the same). Note the A/C relay is at the location shown by the orange arrows (callout 11). The other relay (blue arrows and callout 14) is for RPO C49 electric rear window defogger.
#8
https://www.ebay.com/itm/NOS-1966-75...-127632-2357-0
https://www.ebay.com/itm/Relay-A-C-A...-127632-2357-0
...and is this the relay of which we speak?
Last edited by 72455; January 1st, 2022 at 03:09 PM.
#9
#10
I waited for Joe to reply...since I was about to go postal on those ebay ads. If you recall, Dave (I hope you do) I strongly suggested you DOWNLOAD the parts catalog for your car. I provided you the link(s). Now, go and d/l that parts catalog now. The parts catalog doesn't lie. If Joe grabbed the OEM part number for you already, then you know for certainty the part number is correct (we've been down this route).
Have you downloaded the parts catalog, yet?
Have you downloaded the parts catalog, yet?
#11
I waited for Joe to reply...since I was about to go postal on those ebay ads. If you recall, Dave (I hope you do) I strongly suggested you DOWNLOAD the parts catalog for your car. I provided you the link(s). Now, go and d/l that parts catalog now. The parts catalog doesn't lie. If Joe grabbed the OEM part number for you already, then you know for certainty the part number is correct (we've been down this route).
Have you downloaded the parts catalog, yet?
Have you downloaded the parts catalog, yet?
#12
Thru 1975 - Oldsmobile Chassis and Body Parts Catalog
Grab this while you're at it:Thru 1975 - Oldsmobile Illustration Catalog
#13
And unfortunately, here's the problem with using a newer parts book edition.
The parts book excerpt I showed in Post #7 is from the January 1972 printing.
From the June 1975 Parts History Catalog, the correct 391948 relay was discontinued in July 1973 and was superseded by P/N 412687.
But wait, it gets better. In December 1981 Parts History Catalog, 412687 was discontinued and replaced by 413074. All of these relays are comparable in current-carrying and are physically interchangeable.
And finally, the November 1979 edition of the parts book also shows 413074 as the only available relay that has superseded all other part numbers. That doesn't make it "correct", it just means that this was the closest usable part that was still available in the parts network (the same parts book shows "J" heads for use on all BBOs).
The parts book excerpt I showed in Post #7 is from the January 1972 printing.
From the June 1975 Parts History Catalog, the correct 391948 relay was discontinued in July 1973 and was superseded by P/N 412687.
But wait, it gets better. In December 1981 Parts History Catalog, 412687 was discontinued and replaced by 413074. All of these relays are comparable in current-carrying and are physically interchangeable.
And finally, the November 1979 edition of the parts book also shows 413074 as the only available relay that has superseded all other part numbers. That doesn't make it "correct", it just means that this was the closest usable part that was still available in the parts network (the same parts book shows "J" heads for use on all BBOs).
#14
All good info guys and thanks. So here's where I'm going with this thread...I'm working on a stockpile of OEM or NOS parts and my next goal is the AC relay,...will this one be the right replacement should mine ever go south?
https://www.ebay.com/itm/NOS-1966-75...-127632-2357-0
https://www.ebay.com/itm/NOS-1966-75...-127632-2357-0
#15
All good info guys and thanks. So here's where I'm going with this thread...I'm working on a stockpile of OEM or NOS parts and my next goal is the AC relay,...will this one be the right replacement should mine ever go south?
https://www.ebay.com/itm/NOS-1966-75...-127632-2357-0
https://www.ebay.com/itm/NOS-1966-75...-127632-2357-0
#16
413074 will work. It won't be optically correct if anyone checks the part number. Frankly, it's no different than using a quality aftermarket replacement. Neither one will be the original, "correct" part. Both will look "correct" to the casual observer. For example, Standard Motor Products RY8 replaces 391648, 412687, and 413074 for about $13 at RockAuto.
#17
The blower relay definitely goes bad. The relay contacts pit, resistance goes up, the contacts heat up, and eventually they stick together and the motor won't shut off. I've had this happen twice. Your call on the GM part vs. the SMP part. Standard has always been a good brand, but like everything today, manufacturing has moved offshore. Just stay away from their low-rent "T" series parts, where the part number has a "T" suffix. Those are crap.
#18
#19
I'll be done with it, but since it was brought up, here's the annoying little piece of information regarding the "T" suffix (as an example when an electronic/electric part is produced/supplied/packaged/manufactured/assembled - pick your choice of term):
I could go on to produce many manufacturers who employ TAPE AND REEL PACKAGING, but this is not the thread to do so. There's plenty of "interwebs" information regarding TAPE AND REEL PACKAGING and part numbering.
TAPE AND REEL PACKAGING FOR SMD-4 OPTOCOUPLERS WITH OPTION 7
Dimensions in millimeters
Selected 4 pin optocouplers are available in tape and reel
format. To order a 4 pin optocoupler with option 7 on tape
and reel, add a suffix “T” after the part number,
SFH615A-3X007T.
The tape is 16 mm and is wound on a 33 cm reel. There are
1000 parts per reel. Taped and reeled 4 pin optocouplers
conform to EIA-481-2 and IEC 60286-3.
Dimensions in millimeters
Selected 4 pin optocouplers are available in tape and reel
format. To order a 4 pin optocoupler with option 7 on tape
and reel, add a suffix “T” after the part number,
SFH615A-3X007T.
The tape is 16 mm and is wound on a 33 cm reel. There are
1000 parts per reel. Taped and reeled 4 pin optocouplers
conform to EIA-481-2 and IEC 60286-3.
#20
Norm, what the heck does tape and reel packaging for individual electronic components used in a mass production pick and place assembly line have to do with a finished part that has a T in the part number?
I think the answer is: nothing.
I think the answer is: nothing.
#21
If your original relay casing is in good condition you could replace the guts from a newly purchased relay.
You will just have to take your time to unbend the tabs holding the electronics in both relays and then inserting the new electronics into the old case and sealing back up by re-bending the tabs.
You will just have to take your time to unbend the tabs holding the electronics in both relays and then inserting the new electronics into the old case and sealing back up by re-bending the tabs.
#22
Here's an example. DS177 is their regular quality headlight switch. DS177T is their "economy" quality switch. Neither has anything to do with tape and reel packaging.
#23
So, this is the skinny as I was told and based upon just a little research in which I convinced myself over the years the newsworthy commentaries of my colleagues with much more experience in the actual hardware production of part numbers in the electronic/electrical industry were in fact, true.
There are MANY forms of manufacturing/assembling of electronic/electrical parts. Historically the manufacturing of these items was shall we say "analog", not a bad way to describe it. In the early years, let's use computers as an example, or TVs, or RADIOs, etc. we began with simple tubes and tube arrays which controlled various functions with no board circuitry. It was a mechanical means to electronic/electrical engineering in which, here is a key, parts were certified - a very, very time-consuming labyrinth of labor - but, one which achieved a very high non-failure rate.
Times changed, technology changed, manufacturing of electronic/electrical components migrated from analog/mechanical arrays to digital formats employing board circuitry e.g. recall the early RAND computers, tube TVs, radios, cars, etc. Enter the digital world and board circuitry. Early endeavors had essentially one marketplace - that was to make the best non-fault electronic/electrical components where each received a high degree of certified bench-testing before they left the manufacturer. Move further along in the history of digital engineering and you arrive at the silicon wafer chips (the area I have the greatest familiarity). In the many and various technologies which have migrated into the digital age (the largest of which was the PSTN - Public Switched Telephone Network), but lets include include EVERY single facet of our life, the production of electronic/electrical devices has had to keep abreast with demand. Enter the various "types" of mass production of these components.
Perhaps the best components, components which would not be purchased for say an Ariane 5 rocket to send the James Webb telescope 1,000,000 miles distance from the Earth, would not have part numbers with a "T" suffix. None-the-less, the circuitry includes both electronic and electrical circuit boards with components derived from silicon (ingot) components and nano-components made by select manufacturers who also produce many of the same components.
Let's use RAM as an example. There are literally hundreds of millions of various electronic/electrical components produced to satisfy various industries. MIL-SPEC manufacturers (as and example), medical device manufacturers, etc., etc. will NOT purchase part numbers with a "T" suffix because there is no or extremely limited validation/verification/certification of the components employed in the manufacturing process. The same manufacturers can and do produce the EXACT same model number device assembled in absolute MASS quantity employing tape-and-peel manufacturing. These let's call them "T" components are heavily mass produced with (in many cases) no warranty, limited warranty, no certification - mass produced for the masses. The cost of manufacturing is pennies compared to non-tape-and-peel production. It' far cheaper for a supplier to replace a bad piece of technology designated "T" than to manufacture the exact same component without tape-and-peel ("T") technology. The "T" designation also produces a formidable line of manufacturing fault/non-fault history of manufacturing. So, back to RAM and computers, telephones, etc. and the like - many manufacturers employ components produced via tape-and-peel technology at in many cases 70% - 80% less production cost than the exact same component produced without tape-and-peel technology.
#24
Yeah, I was going to say the same thing. I'm pretty sure that Standard Motor Products isn't using tape and reel packaging on their "T-series" distributor caps or voltage regulators or oil pressure sending units.
Here's an example. DS177 is their regular quality headlight switch. DS177T is their "economy" quality switch. Neither has anything to do with tape and reel packaging.
Here's an example. DS177 is their regular quality headlight switch. DS177T is their "economy" quality switch. Neither has anything to do with tape and reel packaging.
#25
. MIL-SPEC manufacturers (as and example), medical device manufacturers, etc., etc. will NOT purchase part numbers with a "T" suffix because there is no or extremely limited validation/verification/certification of the components employed in the manufacturing process..
Last edited by Fun71; January 1st, 2022 at 08:04 PM.
#26
Norm, your lengthy post #23 above is not quite correct. I work at an implantable medical device manufacturer and ALL of our components are tape-and-reel in order to facilitate automated parts pick-and-place; it has ABSOLUTELY nothing to do with the quality/reliability of the components. ALL of our parts are higher than MIL-spec quality as they go into life saving medical equipment, and they are ALL tape-and-reel so that they can be placed by the automated Muehlbauer pick-and-place equipment.
Last edited by Vintage Chief; January 1st, 2022 at 08:14 PM.
#29
By someone with inaccurate information, or your recollection of the information is inaccurate. The T suffix merely designates the packaging method, which is whatever the buyer specifies for that particular component. The packaging has no correlation to the quality level of the part.
#30
By someone with inaccurate information, or your recollection of the information is inaccurate. The T suffix merely designates the packaging method, which is whatever the buyer specifies for that particular component. The packaging has no correlation to the quality level of the part.
I only brought up the topic because I noticed Joe mentioning to stay clear of parts numbers ending with the suffix “T” (read above) - that was not my statement. Perhaps this is industry based. Perhaps technology has advanced and assembly packaging production has improved greatly and within select industries. I’m not a manufacturer, I’ve purchased significant quantities of both precise industrial IT components (primarily RAM modules) and consumer based RAM modules for 100,000+ employee organizations. Evidently I was fed a bunch of mumbo jumbo. I guess it’s all whimsical nonsensical BS not worth engaging in conversation. I remain curious as to why an automotive part is labeled with and without a suffix “T” and why the suffix “T” equates to crap?
Last edited by Vintage Chief; January 1st, 2022 at 11:05 PM.
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