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wiring diagram for early corvair conversion from generatoir to alternator
Posted by: olen ()
Date: November 02, 2012 10:23PM

I just installed a 1975 Chevrolet Nova 350 Ci alternator with internal regulator on my 1962 Corvair Spyder, in place of the generator. I have a Corsa Tech Guide for Corvairs and wired the alternator PRECICESLY as instructed, and illustrated in the Tech Guide. Both warning lights come on when the ignition is turned on, HOWEVER,when the engine is started, the "Gen/Fan" light remains ON and will NOT go out. Can anyone help me with this problem as NO ONE I know who owns a Corvair, can instruct me as to how to remedy this problem

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: dansk ()
Date: November 02, 2012 10:41PM

Is the alternator designed to run backward?
Dann

Dann
So. Calif.
Granada Hills
Daily drivers
1996 Ford E350 Powerstroke diesel
2003 Volkwagen Jetta
Fun cars
1965 Corsa Turbo (currently undergoing total restoration) + 65 Corsa 140 waiting for resto
1994 Dodge Viper RT10
1996 Dodge Viper GTS
1998 Dodge Viper GT2

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: acardon ()
Date: November 02, 2012 11:02PM

When the gen light doesn't go out, it indicates that it is not charging, so you need to determine if it is charging and the light is giving a false indication. Read the battery voltage and output voltage of the alternator when reved to 12 or 1500 RPM. If the voltage is 13.5 to 14.5 the alternator regulator may be bad or it's wired wrong.

The Trunk Belongs in Front, Ask Any Elephant
Caution: Images in This Mirror May be Waterpumpers
Don
NTCA....DFW,TEXAS
66 Monza 1 owner

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: MattNall ()
Date: November 02, 2012 11:03PM

Alt. will turn either direction and work!


Welcome to the CCF Olen! Tell us where you are!

Wiring diagram is in our FAQ Sticky at the top of the page!

"Rules and FAQ's" Look under Electrical





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: olen ()
Date: November 02, 2012 11:27PM

I'm in Redding Cal. It's my understanding that atlernators will charge in either directions. My volt meter indicates 14.4 volts. The oil pressure light works as it's supposed to, and the gen/fan light comes on with the ignition turned on. When I start the engine the oil pressure light goes out but the gen/fan light remains on. I have the wiring diagram from the Corsa Tech Guide , and I'm wired according to it. Could this problem stem from a poor ground? I have the braided negative groung wire attached at the rear mounting bracket but should I attach another groung wire to the altenator? IT also is grounded at the mountimg bolts. I am at a real loss here, AND just a bit frustrated I'm afraid.
lenelo@att.net">olenelo@att.net

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: MattNall ()
Date: November 02, 2012 11:39PM

NO!!! you problem is in your Indicator light Circuit...


'65 and newer Vairs have a resistor added!


so first Buy a Brighter light bulb and see if it goes out.. common fix!





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: olen ()
Date: November 03, 2012 12:51AM

Thanks Matt, I'll purchase a brighter bulb and see what happens.And IF it works , I'll letr you know.Thanks again,
Olen

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: MattNall ()
Date: November 03, 2012 01:00AM

Here's a topic on it with pics

[corvaircenter.com]





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: MattNall ()
Date: November 03, 2012 01:02AM

From our FAQ's







MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: VegasVair ()
Date: November 03, 2012 01:51AM

Will that picture work for an EM?
Is there an Acc. position on EM ignition switches?
Don't think my '62 I bought new had Acc. on the ignition switch.

65 Corsa 140/4 A/C convert.
CORSA+Vegas Vairs

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: MattNall ()
Date: November 03, 2012 01:52AM

VegasVair Wrote:
-------------------------------------------------------
> Will that picture work for an EM?
> Is there an Acc. position on EM ignition
> switches?
> Don't think my '62 I bought new had Acc. on the
> ignition switch.
===============================================

Just put a Blocking diode in the wire that is shown at the ACC. term..... keeps it from backfeeding.





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: vairmech ()
Date: November 03, 2012 02:11AM

Here is right out of the tech guide. It has worked well for me many times.



Ken Hand
CORSA Central Division Director
CORSA Treasurer
248 613 8586
[www.corvairmechanic.com]
vairmech@aol.com

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: MattNall ()
Date: November 03, 2012 02:21AM

Ken, that's what he used!!





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: Paul Iiames ()
Date: November 03, 2012 12:06PM

Are you still running through the Regulator?
I used the wiring diagram from Geoff Johnson in the FAQ under Electrical.
I did away with my Reg. and used the wire block instead. It was simple to wire this way and every thing has been working great, no problems with the dash lights.

Always on Vacation
in Lexington, Texas
(an hour east of Austin,Tx)
1964 monza convertible
Azure Aqua Metallic
Lonestarcorvairs.com
new weels

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: vairmech ()
Date: November 03, 2012 01:10PM

In the pic I posted the regulator is only there for a connector terminal. I also remove the regulator totally and use a block for the battery connector. Everyone here has said that you need to add a resistor or a diode somewhere, I never have on all the conversions I have done and never had a problem that wasn't alternator related. I can live with a glowing light at night with the high beams on. If the alternator quits working the light does come on BRIGHT!

I also use most of the existing wire harness and I don't add but one wire. The field wire for the generator can become the #1 terminal connector on the alternator and the other end at the regulator gets cut off of the "A" terminal wire and gets connected to the #10 brown connection. (If you remove the connection from the regulator and tape well, the wire does not need to be cut.) That is the idiot light connection.

The #2 connector on the alternator does not have to go to the battery. That is the best way but it doesn't have to. The "A" wire at the Gen end can connect to the #2 connector on the alternator and become the sense wire. (The #2 connector can also just loop around and get connected to the output terminal of the alternator.) Then run a #10 wire from the alternator output up to the "B" connector wires at the regulator. IF, you use the regulator for the connector, this should be the only connection on the regulator otherwise tie the wires together with a small screw and tape well or use a connector block. There should be 3 wires here, 4 if you run the #2 alternator sense wire there also.

It seems simple enough to a lot of us but if you don't have a basic understanding of wiring diagrams and wiring, you probably shouldn't attempt this without help of someone that knows electrical.

Ken Hand
CORSA Central Division Director
CORSA Treasurer
248 613 8586
[www.corvairmechanic.com]
vairmech@aol.com

[s186.photobucket.com]

Photobucket
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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: larry202br ()
Date: December 04, 2012 02:55PM

Make sure you have an alternator with an internal regulator. It seems on the surface that, if your alt terminals are marked F and R, that is externally regulated, and you need to (still) use the external regulator. The internal regulated alternators are marked 1 and 2, near as I can tell.

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: Richard ()
Date: December 04, 2012 05:13PM

Here is the internal regulated version of the drawing that Matt posted above. Notice the similarities. If you take the regulator and all the wires between the reg and gen and then stuff them inside the new gen, you still have the same three wires connecting to the upper half of both drawings.

If you don't have an Acc position on the Ignition switch, connect a 10 Ohm, 10 watt resistor across the lamp. A larger lamp should work as Matt suggested, but Delco used the 10 Ohm in case the lamp failed. If you turn the key to "ON" and see that the lamp has failed, the resistor will complete the circuit and the gen will continue to charge normally until you have a chance to replace the lamp.

GM used a resistor wire hidden inside the dash harness and they did it on nearly all cars and trucks with the 10DN externally reg alternator and the 10SI and 12SI internal reg alternator wiring



Edited 1 time(s). Last edit at 12/04/2012 05:14PM by Richard.

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: Bob Helt ()
Date: December 04, 2012 05:27PM

Is there an Acc. position on EM ignition switches?
Don't think my '62 I bought new had Acc. on the ignition switch.

No ACC switch POSITION at all for EM ignition switches. Em ignition switches all were missing an ACC TERMINAL, unless they got factory or dealer installed A/C. Then the switch had an ACC TERMINAL for the A/C. Same too if the switch was replaced for some reason. 1964 Corvairs may have had this switch too.
Regards,
Bob Helt

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: 66vairman ()
Date: December 04, 2012 05:45PM

By 1973 most GM vehicles used the internally regulated 10SI alternator.

Installing internally regulated alternators in a 65 or later Corvair requires using the Corvair 10DN front housing on a 10SI and making wire changes per diagrams to by-pass the old external regulator.

I DON'T know if the generator cars used a warning light by-pass resistor (doubtful).

The 10DN alternator cars used a 1895 bulb at about 52ohms in parallel with a by-pass 10 ohm resistance wire (rating is 10 Watts - a lot, requires a wire wound resistor to emulate).

If the alternator is charging, then the 10SI internal secondary diode pack will energize the "FIELD" once the alternator is turning. Once the internal "FIELD" power source is energized then voltage at terminal 1 should be the same as the output voltage - so the warning lamp has no point of ground - same voltage on both sides of bulb and resistor and it won't illuminate.

First - with the engine off you pull off the #1 wire at the alternator and turn the key on and the warning lamp should NOT light - if it does you've got a wiring problem. If the lamp does not come on then the alternator field energizer circuit could be bad IF the warning lamp stays on AND the alternator is putting out about 14VDC with the engine running.

BTW - always ask the counter guy to test a rebuilt alternator before you take it home and dismantle it to put on the Corvair 10DN front housing.

Also – So called “ONE WIRE” 10SI alternators simply disconnect terminals 1, but you have to rev the engine to about 1,500 RPM on start up so the internal field voltage diodes pass adequate voltage to turn on the internal regulator so you have voltage output. The terminal 2, sense voltage, is simply tied inside the alternator so you only need “ONE WIRE” – crude but effective.

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Re: wiring diagram for early corvair conversion from generatoir to alternator
Posted by: wv-geo ()
Date: December 04, 2012 09:53PM

MattNall Wrote:
-------------------------------------------------------
> Alt. will turn either direction and work!
>


The alternator will charge in either direction, but the fan won't cool properly.
You have to change out the fan/pulley to the one from the Corvair.

Dan Stark
Hurricane, WV

1964 Corvair 500 Coupe, 140HP, 4spd (Christine)
1965 Mustang Coupe, 6cyl, 3spd

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