TI Voltage Regulators 1116368 / 374 / 378 ?

[Wayne M.]

I'm a little hazy on the use of these rare parts and I'd like to get feedback. Conventional wisdom says they were a one year / one use item ('65 K66 cars with C60, which limits to L76 and L79 cars). Indeed, my '70 Corvette Parts Manual says # 1116378 is for K66/C60 combos, '65 only. But I suspect that by 1970 this # may be a SERVICE #, and that no '65's left St.Louis with this part #.


I postulate this from the 3 NOS examples I have; (1116368 -dated 4K; 1116374 -dated 5C; and 1116378 -dated 7J), all identical in external appearance. Also, it only appears in the '65 AIM (under the K66 option) as # 1116368, and view "B" indicates use for L76/79 w/C60. In the '66 AIM, it shows as the choice for NON-AIR, TI cars (C60 w/K66 calls for the standard # 1119515 regulator). In the '67 AIM, section K66, there is a revision removing reference to 1116368 and 1119515; ie. K66 had no effect on the choice of voltage regulator. Note that in all 3 years of AIM's, there is NO reference to # 1116374 or 378.


Jack H. has previously mentioned they were used sporadically on EARLY L78's, as the Car & Driver road test photo confirms.


Do any original cars have TI volt regs OTHER than 1116368, and if so, what is the date stamp ? Excuse me if this is addressed in the NCRS '65 Tech Manual, as mine is out on loan.


If Loren Lundberg is tuned in, I know he has studied this subject and may be able to help.


Thanks

[Joe L.]

Re: TI Voltage Regulators 1116368 / 374 / 378 ?

Wayne-----


GM #1116368 was the original PRODUCTION part number for the voltage regulator. This same part number was also available in SERVICE from 1965 to 1968. In 1969, the SERVICE part number was changed to 1116378. This part was discontinued in about 1985-6 and replaced by GM #1985902, which continues to be available. The GM #1116374 is a part number that I cannot find any reference for in CHEVROLET parts references for the 65+ period. However, I have ascertained that it is also a predecessor part number to the 1985902 regulator. But, I do not believe that it was a case of 1116368 TO 1116374 TO 1116378 TO 1985902. I believe that it was a case of 1116368 TO 1116378 TO 1985902 AND 1116374 TO 1985902.


The GM #1116368 regulator was not used only on TI/AC 1965 Corvettes. It was also used on ALL 1965 Chevrolet passenger cars and light trucks with 62 amp alternators, ALL 1965 full size and Chevelle passenger cars with TI/AC and ALL 1966-67 full size passenger cars with 62 amp alternator. Other than the 1966 AIM reference, I can find no documentation that the 1116368 regulator was used in 1966 Corvette applications, but it may have been. The 1985902 regulator which replaced both the GM #1116378 AND the GM #1116374 regulators has very wide GM divisional parts usage. It is used in Chevrolet, Pontiac, Buick, Oldsmobile, and GMC Truck applications. It may be that the GM #1116374 was originally used only in non-Chevrolet applications. And, it may also be that the GM#1116368/1116378 regulators were used in other, non-Chevrolet GM car lines.

[Loren]

Re: TI Voltage Regulators 1116368 / 374 / 378 ?

Wayne: It's good to see that you are at least wiling to now concede that GM MADE a "368" TI regulator. In fact during CALENDAR YEARS, they made: 1964 5(svc) & 378 (prod); '65 50 (svc) & 186 (prod); '66 274(svc) & 10 (prod); '67 258 (svc) & 13 (prod); ' 68 300 (svc) & 12 (prod); '69 353 svc; '70 259 svc; '71 43 svc; '72 38 svc; '73 65 svc; '74 44 svc; '75 39 svc; '76 20 svc; '77 NONE & '78 1 svc. Why do I think that the one made in 1978 was for an AC-DELCO executive? The cancellation order was issued on November 13, 1979 declaring this piece obsolete. Usage in 1965 was listed for Corvette, 60 amp option EXCEPT Corvair, Chevelle & Truck. "378" production begins 7/13/64 and is used on Chevrolets w/ll00697 & 1117765 alternators (60 & 62 amp), Chevelles, trucks, some Buicks, Pontiacs & GMC. It is superseded 8/26/1966 by 1985902, which is made until discontinued in 1980. Please don't ask "HOW' they work or "why"? LL

[Joe L.]

Re: TI Voltage Regulators 1116368 / 374 / 378 ?

Loren-----


A couple of comments:


1) The 1116378 regulator was still available as of 12/1983; as a matter of fact, it is still listed under that number in the 12/1983 edition of the GM Corvette Parts and Accessories Manual. I don't see how it could have been discontinued in 1966 and be so-listed. Even considering that it may have ceased production earlier than its discontinuation date, its hard to understand how it could have ceased production in 1966 but remained available in the GM parts sytem until 1985 or 1986. My information has it being discontinued in 1985 or 1986.


2) As of 11-1-99, the GM #1985902 regulator was still available from GM. As of that time it GM lists for $418.00.

[David D.]

Re: TI Voltage Regulators 1116368 / 374 / 378 ?

OK, now that I have followed the thread from start to finish, what regulator should be on my 67, 400hp, TI, C60 #14403?

[Wayne M.]

Re: TI Voltage Regulators 1116368 / 374 / 378 ?

O.K. Dave --- about that short (but number heavy) thread; I believe that in your case of a '67 with C60/K66, there's no doubt you should have the standard points/relay-type regulator (1119515 ?). Even if you had a '66 without C60, in spite of what the AIM shows, the 1119515 is probably correct.


That being said, the TI unit sure looks bitchin' bolted to that fender; same mounting pattern and same 4-spade connector -- great conversation piece; just remove prior to judging. Do NOT use the radio suppression condensor.


As to those with a '65 L76 or L79 with C60/K66, I THINK it should be 1116368, after reading Joe and Loren's posts -- this concurs with the AIM.


BTW, checked my Canadian Master Price Book, Feb '80, and the 1116374 was list priced at $ 123, and the 1116378 was $ 86; no listing for 1116368, which usually means no longer available.


Other info: the 1116368 is in an orange/black/white Delco box with the Delco number D-636; the 1116374 is in the same type of box with Delco # D-638; I have no box for the 1116378.

[Loren]

Re: TI Voltage Regulators 1116368 / 374 / 378 ?

The date that you were provided with was the date that AC-DELCO discontinued the "378" - if you have information on when GM finished selling that production, please let us know.

[Loren]

Re: TI Voltage Regulators 1116368 / 374 / 378 ?

I would agree with Wayne's response - "9515".

[Joe L.]

Re: TI Voltage Regulators 1116368 / 374 / 378 ?

Loren----


The GM #1116378 regulator was discontinued from GM SERVICE PARTS in January, 1984 and replaced at that time by GM #1985902. The GM #1985902 was still available as of November, 1999 for a GM list price of $418.00. There are many dealers throughout the US that carry this item IN STOCK.


The GM #1116374 regulator was discontinued from GM SERVICE PARTS in June, 1984 and replaced by GM #1985903. The GM #1985903 regulator was discontinued from GM SERVICE PARTS in June, 1992. There was no replacement.