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Alternator question - somewhat Corvair related
Posted by: Mark Pietz ()
Date: January 05, 2018 10:29AM

The Corvair uses a Delco 10 style alternator, external regulation. I once converted to an internal regulator once (10si). On my old truck I have a 10si and it burned out, so I bought a kit and "rebuilt" it. Inside the alternator there is a small, 40 ohm resistor that doesn't show up on my very detailed IH service manual. It bridges the regulator. So not all 10si's had this component. Does anyone here know what it does and why some would have it and other don't? In this pic (not mine) it is the thin, wire wound cylinder at about the 7 o'clock position (if it were a hand it would be pointing to 7).

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Re: Alternator question - somewhat Corvair related
Posted by: joelsplace ()
Date: January 05, 2018 10:40AM

I've had many of those apart and all but one had the resistor and that one had other parts missing also.

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Re: Alternator question - somewhat Corvair related
Posted by: beenzo2since71 ()
Date: January 05, 2018 02:39PM

that 7 o'clock resister is for your lite on the dash, al

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Re: Alternator question - somewhat Corvair related
Posted by: Mark Pietz ()
Date: January 05, 2018 04:30PM

So if I have a vehicle with an ammeter and no idiot light, I could leave it out?

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Re: Alternator question - somewhat Corvair related
Posted by: Timothy Shortle ()
Date: January 05, 2018 05:21PM

Not to hijack your thread Mark but what is the purpose of the condenser? Radio noise would be my GUESS.

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Re: Alternator question - somewhat Corvair related
Posted by: oldqmguy ()
Date: January 06, 2018 12:30PM

I have found a file that that explains HOW a Delco Remy "Delcrotron Generator" (Alternator to the rest of us!) works. I can't upload a pdf file to the forum so I have attached a few pictures that should show 'where' and 'how' R6 (the resistor in question) works.

Delcrotron 1 shows the schematic for the 10-SI Alternator. At the top (just under the 'lamp' and 'switch') you will see resistor R6.

Delcrotron 2 shows the sentence that "explains" what R6 does: "Resistor R6 carries some of the indicator lamp current, and is identified in figures 9, 11, and 13."

Delcrotron 3 is a picture of the 'inside' of the 10-SI showing R6 ("Resistor used on some models").

The Regulator in the 10-SI Alternator switches the FIELD CURRENT OFF and ON to regulate the Voltage Output, making it very up and down almost a volt. This variance changes as the speed of the engine changes. The "Capacitor" that was asked about is said to 'reduce these fluctuations and suppress radio noise.'

I hope this helps! confused smiley

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: Alternator question - somewhat Corvair related
Posted by: 66vairman ()
Date: January 06, 2018 01:05PM

Dale - good info. See PM.

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Re: Alternator question - somewhat Corvair related
Posted by: American Mel ()
Date: January 06, 2018 01:33PM

They can TRY to fool us, but I know a FLUX CAPACITOR when I see one ! ! ! spinning smiley sticking its tongue out

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Alternator question - somewhat Corvair related
Posted by: beenzo2since71 ()
Date: January 06, 2018 03:45PM

yes tim , the capacitor is for radio inference , al

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Re: Alternator question - somewhat Corvair related
Posted by: Mark Pietz ()
Date: January 06, 2018 04:18PM

I eventually stumbled onto this same diagram. My Scout uses an ammeter, and no idiot light, and the replacement alternator has this resistor in it. In my case, having one or not will make no difference. My FSM shows it without it, but that makes sense because they used ammeters. Everything is illuminated eventually. cool smiley

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Re: Alternator question - somewhat Corvair related
Posted by: Brizo ()
Date: January 06, 2018 04:37PM

IIRC, Back when we used to repair these alternators, a leaking diode in the "trio" was a common cause of a glowing GEN light.

Dan Brizendine,
'64 8door Greenbrier 140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

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Re: Alternator question - somewhat Corvair related
Posted by: oldqmguy ()
Date: January 06, 2018 04:51PM

The "Resistor (R6)" was used to make the indicator lamp more useful but made no difference in a vehicle with an ammeter. I suspect it was 'left out' to save a few cents on ammeter equipped vehicles!?

Dan was right, I have replaced a couple of 'diode trios' to fix the glowing indicator light.

Here is one more picture showing the 10-SI with connectors labeled.

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: Alternator question - somewhat Corvair related
Posted by: MattNall ()
Date: January 06, 2018 05:02PM

Dale... that's an External regulator style.... I've had a few...





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Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Alternator question - somewhat Corvair related
Posted by: oldqmguy ()
Date: January 06, 2018 05:08PM

Matt,

Here is the FULL Opening Page of this document. It is about INTERNAL REGULATED Alternators!

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: Alternator question - somewhat Corvair related
Posted by: MattNall ()
Date: January 06, 2018 05:11PM

All those I've had with the #1 & #2 terminals "one behind the other" instead of Side by side have needed regulators...





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Alternator question - somewhat Corvair related
Posted by: oldqmguy ()
Date: January 06, 2018 06:33PM

"SI" means System Integrated!

This is Delco Remy's way of saying it is Internally Regulated.

This is a Delco Remy document so they may have used the wrong picture.

The next 7 pages describes the operation and maintenance of the 10-SI, 15-SI,and 27-SI Internally Regulated alternators.

Dalecool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: Alternator question - somewhat Corvair related
Posted by: MattNall ()
Date: January 06, 2018 06:43PM

That must be it...





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Alternator question - somewhat Corvair related
Posted by: joelsplace ()
Date: January 06, 2018 07:12PM

That is the right picture and it has the inline blades on the regulator. The externally regulated one looks a lot different and you can see the diodes from the back.

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