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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: enaberif on February 04, 2015, 07:15:55 pm

Title: What Am I? (Alternator)
Post by: enaberif on February 04, 2015, 07:15:55 pm: I am big and I am heavy. I measure 8" across the bolt holes from the center points. I do not seem to be a 10si nor do I seem to be a 12si. According to the clock position I am a 1 o'clock alternator not a normal 3 o'clock gm alternator. I have Delco Remy name branded on my case. Oh and I also do not fit properly with the alternator bracket.

Can you tell me who I am please.

(http://i.imgur.com/GwsWItK.jpg)
(http://i.imgur.com/gcxkbkj.jpg)
Title: Re: What Am I? (Alternator)
Post by: VileZambonie on February 04, 2015, 07:23:24 pm: http://www.madelectrical.com/electricaltech/delcoremy.shtml
Title: Re: What Am I? (Alternator)
Post by: enaberif on February 04, 2015, 07:26:58 pm: Quote from: VileZambonie on February 04, 2015, 07:23:24 pm
http://www.madelectrical.com/electricaltech/delcoremy.shtml

Yeah I read that page as well as read the page that has the dimensions of AC Delco alternators and nothing matches up.
Title: Re: What Am I? (Alternator)
Post by: ehjorten on February 05, 2015, 10:53:27 am: Looks like a 27SI. Your pictures do not show the mounting ears from the side, but it looks to have 2 ears on the bottom mount. The back one having a bushing in it. The inside distance between the ears should be 2.60" and be 0.39" Diameter.

27SI has a high amp output at idle. It is recommended for passenger car and light trucks when high output at idle is necessary. There is a 100 A and an 80 A version. The 80 A version has a special R-terminal for use with electric tachs and tach hour meters, etc.

The only Original to Service 27SI-100 part number that I could find is 1105500 (AC Delco Reman. #10459234 and AC Delco Catalog #321-744

There are 2 Original to Service 27SI-80 part numbers that I could find: 1101058 and 1101061 (Delco Remy Reman. #'s: 19020504 and 19020504, respectively)
Title: Re: What Am I? (Alternator)
Post by: Shifty on February 05, 2015, 11:33:21 am: It looks like a Lester (industry p/n) 7135.
Title: Re: What Am I? (Alternator)
Post by: enaberif on February 05, 2015, 12:53:20 pm: Thanks guys definitely looks like a 27si alternator!
Title: Re: What Am I? (Alternator)
Post by: zieg85 on February 05, 2015, 01:09:04 pm: http://www.ebay.com/itm/Alternator-27SI-Isolated-Ground-Military-Vehicle-Cucv-12-Volt-100-Amp-New-/261261934095?pt=Other_Vehicle_Parts&hash=item3cd46cbe0f&vxp=mtr

Yes I think the mystery is solved
Title: Re: What Am I? (Alternator)
Post by: enaberif on February 05, 2015, 01:25:14 pm: Well crap if this thing is a 100a alternator I may just keep using it. Guess I'll get it tested to see what happens!
Title: Re: What Am I? (Alternator)
Post by: zieg85 on February 05, 2015, 01:36:02 pm: They made 80 amp versions also
Title: Re: What Am I? (Alternator)
Post by: enaberif on February 05, 2015, 01:37:09 pm: Quote from: zieg85 on February 05, 2015, 01:36:02 pm
They made 80 amp versions also

Yeah I'll take it in and get it tested.